There was an arming sequence, on the iPhone now, that required a thumb and forefinger, with the other forefinger needed to fire the thing. Milgrim hadn’t been entirely sure what a Taser was before, but he was getting an idea. If he accidentally fired it, here in the Vegas cube, a pair of barbed electrodes would shoot out, on two thin fifteen-foot cables, propelled by compressed gas. That was strictly once-only, the barb-shooting. If the barbs went into Bigend’s spotless plasterboard wall, the penguin was anchored there, he supposed, and there was a lot of fine cable around. But if you tapped the iPhone again, in the firing circle on the screen, the wall got shocked. Which wouldn’t bother the wall, but if those barbs happened to get into anybody, which was what they were actually for, that person got a shock, a big one. Not the kind that would kill you, but one that could knock you down, stun you. And there was more than one shock stored in the toy airship cabin Voytek had taped under there.