`Chocolate?' said Ridcully.
`They don't like it, sir.'
`But those things can live in empty space and inside stars, man!'
`Where chocolate is significantly absent, sir,' said Ponder, patiently. `They keep away from it. Also, it comes handily packed. They particularly don't like the Strawberry Whirl.'
Ridcully picked up a bow, pointed it at a wizard, and fired. There was a distant `ow!'
'Hmm. Spreads nicely on impact,' he said. `Well done, Mr Stibbons. I'm impressed. You are in charge.'
The Dean bridled at this. `I protest! I am the Dean, when all is said and done!'
`Oh, all right, Dean, you can come! But, and I want to make myself absolutely clear, you are not to point anything at anything unless I give you a clear instruction, understood?'
`Yes, Mustrum,' said the Dean meekly.
`Furthermore, you will not, at any point, wave your weapon in the air and shout "choc and load". Is that clear? I say that because I can practically see the silly words forming in your head!'
`That's a vile calumny!' the Dean shouted.
`I hope so. Stibbons, wait here with the proctors and see no harm comes to Mr Darwin. Hex, you know where to send us. Invisibly, if you please!'
While Charles Darwin was sitting in a blue haze in Unseen University, a slightly younger Charles Darwin was staring out at the rain, noting idly that the rain sounded a little like whispering.
A drawback of invisibility is that no one can see you; it is in fact the main drawback if there is a group of you -
`- that was my foot!'
`Who is that?'
`Look where you're going!'
`And what help will that be?'
`Keep it down, you fellows! He'll hear you!'
At which point, the wall in the corner dissolved and brilliant light shone through. Beetles of all sizes and colours poured into the study in a shimmering torrent.
A figure that the wizards recognised stepped though the hole and looked around him with an air of amiable bewilderment. He had a slightly lopsided circlet of leaves on his head, and glowed with the light of deity.
`Mr Darwin?' he said, as the figure in the corner turned and stared. `I understand you are studying evolution and are currently perplexed?' 'Look behind him!' Ridcully whispered.
The unseen wizards stared into the flickering hole. There was sand, and sea in the distance, a suggestion of moving shadows ...
`After me,' Ridcully hissed, as an astonished Darwin dropped to his knees. `Let's get them ...'
The wizards poured through the camiloop, while behind them an elderly voice said: `Of course, selection is, ahaha, anything but natural. Take, for example, a species of parasitic wasp ...'
The sand boiled. Sometimes handfuls of it fountained into the air. One invisible person can move with stealth and speed. Half a dozen invisible people are an accident waiting to happen again and again.
`This is not being our finest hour,' said the voice of Ridcully. `Every time I start to stand up someone else treads on me! Can't Hex sort this out?'
`We're back in the real world,' said the invisible Dean. `Hex's power isn't so strong here. It'll take him some time to find us. Would you mind getting off my leg. Thank you so very much.'
`That's not me, I'm over here. I don't see why it's a problem. We were in another world, after all!'
`Roundworld is right inside the High Energy Magic Building,' said the Lecturer in Recent Runes. `We're thousands of miles way, I suspect. Could I possibly suggest we all endeavour to crawl away in different directions? If you, Dean, head for that little bush with the red flowers, and Rincewind - where's Rincewind?'
`Here,' said a muffled voice from under the sand.
`Sorry ... you head for that rock there. ..'
By degrees, with only the occasional curse, the wizards were able to get to their unseen feet.
`This is Mono Island, I recognise that mountain,' said Ridcully. `Look out for-'
`Why didn't we just bop him on the head?' said the Dean. `Just a tap on the noggin? Then we could have dragged him back here, end of problem.'
`But it's quantum,' said Rincewind. `We have to deal with what's happened. If we stop it happening before it happens, the other things we've. ..' he hesitated. `Look, it's quantum. Believe me, I'd prefer it the other way.'
`Anyway, you can't just bop gods on the head,' said Ridcully, now a faint outline against the distant ocean. `It doesn't usually work and it causes talk. The other gods would be bound to hear about it, too.'
`So? None of them like him. They exiled him here after he invented the hermit elephant!' said the Dean, who was also fading into view.
`It's the look of the thing,' said Ridcully. `They don't want to encourage deicide. Besides, look up there ...'
`Oh dear,' said Rincewind. `Auditors ...'
A grey cloud was rolling down the mountain. As it neared, it contracted upon itself, growing darker.
`They've learned things,' said Ridcully. `They've never done that before. Oh, well ... Rincewind, first line of defence, if you please. And hurry!'
Rincewind, who'd always operated on the assumption that if you carried a weapon you were giving the enemy something extra to hit you with, held up a placard. It read: GO AWAY.
`Stibbons says it should work,' said Ridcully, uncertainly.
The Auditors drew closer, merging until, now, only half a dozen were left. They were dark, and full of menace.
`Ah, they probably aren't the reading sort, then,' said Ridcully. `Gentlemen, it's chocolate time ...'
It had to be said that the most of the wizards were not natural aimers. A spell went where you wanted it to go. You just had to wave in the general direction. They'd never learned to be serious about pointing.
Some shots went home. When several hit an Auditor it let out a thin scream and began to break up into its component robes, which then evaporated. But one, slightly larger than the others, zigged and zagged through the tumbling chocolates. Auditors did learn here ... and the wizards were running out of chocolate.
`Hold it,' said the Dean, pointing his bow.
The shape stopped.
`Ah,' said the Dean, happily. 'Ha, I expect you are wondering, eh, I expect you are wondering, indeed, if I have any chocolate left? And as a matter of fact I'm no-'
`No,' said the Auditor, drifting forward.
`What? Pardon?'
`I am not wondering if you have any chocolate left,' said the dark apparition. `You have none left. The Higgs & Meakins Luxury Assortment comprises two each of: Walnut Whips, Strawberry Whirls, Caramel Bars, Violet Creams, Coffee Creams, Cherry Whips and Walnut Clusters and one each of Almond Delight, Vanilla Cup, Peach Cream, Coffee Fondue and Lemon Extravaganza.'
The Dean smiled the smile of a man whose Hogswatches had come all at once. He raised the bow.
`Then be so kind as to say good day to the Nougat Surprise!'
There was a twang. The sweet flew. For a moment the Auditor wavered, and the wizards held their breath. Then, with the slightest of whimpers, it faded into nothing.
`Everyone forgets the Nougat Surprise,' said the Dean, turning to the other wizards. `I suppose it's because it's so irredeemably awful.'
There was nothing but the sound of the sea for a few seconds. Then:
`Er ... well done, Dean,' said Ridcully.
`Thank you, Archchancellor.'
`A little too showy, nevertheless. I mean, you didn't have to chat to the thing.'
`I wasn't in fact sure if I had used the nougat,' said the Dean, still smiling. Quite an effort would be needed to wipe that smile away, Ridcully knew, and so he gave up.
'Good show, all the same,' he mumbled, and then raised his voice.
'If you can hear me, Hex ... back to the Great Hall, please.'
Nothing happened. An important part of transferring matter across the world is the moving of an equivalent mass the other way. This can take a while.