[AmesVond]

Has anyone ever heard of a gun that shoots huge amounts of foam that traps people in the foam?

 

[matt g]

Yes, the Marine Corps experimented with them for a while, but I think they ended up giving up on them. You might see if companies like ALS offer things like that.

 

[Benning Boy]

I believe you mean a fire extinguisher.

 

[freefall]

Maybe you could say "Red Light" get everyone to freeze, spray them with urethane insulation, and not say "Green Light" til it hardens.