Even if dark matter tried to do that, the moment he got close, kaboom. There is a way I cans we serenity surviving. To be honest, it is an out of the box idea and this is why I make tactical characters. Because I have out of the box ideas. One would have to put a force field that perfectly fits jacks hand, that way he wouldn't be able to take his hand off of the deadman switch, however, no one knows about the vest and nobody can see jack in his invisible situation.