Has anyone ever heard of a gun that shoots huge amounts of foam that traps people in the foam?
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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.
I believe you mean a fire extinguisher.
Maybe you could say "Red Light" get everyone to freeze, spray them with urethane insulation, and not say "Green Light" til it hardens.