His father's voice stopped and the cube projection stopped. Dom shot a glance upwards.

Something small glittered in the air, like a mote of metallic dust. He heard Joan's voice, every word as crisp as frosty air.

'Samhedi, there's another one in here. Be ready .'

'What is it?' asked Dom. The fleck appeared to have grown.

'A collapsed proton. Does that help you?'

'Sure. Like in a matrix engine.'

'Something like that. By the look of it it's already ingested its own atom. What you can see is angular light effect. It's being controlled.'

The first thing that Dom realized was that both of them were standing like statues. The second was...

'I have seen that before.'

'It was the gravity whirlpool that got you before, though. Take one step now and it'll be a bullet with teeth. Ever been sucked through a hole one micron across?'

'Uhuh.'

'I'm sorry, that was tactless. If Samhedi doesn't get here soon you won't have to bother about that, though.'

'Asphyxiation? It'll suck the air out of the room.' She nodded.

'Samhedi's voice came from the wall grille.

'When I say so, please to lie flat on the floor, keeping away from the approximate centre of the room... now!'

Dom caught a glimpse of a flying silver ball the size of a grape before he hit the floor.

When he rolled over it was floating a metre above his head. There was an odd sensation of heat along his spine. They had caught it in a matrix field. It was still sucking up air like a miniature tornado. Presently it drifted out through the wall, leaving a hole with its edges twisted into high-stress shapes. He could hear shouts outside, and the whine of the matrix generator.

He helped Joan to her feet.

'You seem to have it all figured out,' he said.