you're going to remote-detonate the nuke... before the asteroid...
Truman: So you drill, drop the nuke, and leave. Here's the key: you're going to remote-detonate the nuke... before the asteroid passes this plane,
[Quincy shows a video of the asteroid]
Truman: Zero Barrier. If you do that, the fragments of the asteroid will be deflected enough to pass right by us. If the bomb explodes after Zero Barrier,
[the video of the asteroid fragments hitting the Earth is displayed]
Truman: game's over.