After a lot of thinking and testing how to implement some sort of traps i finaly found a working solutiuon (at least i hope so).
The problem was to use traps that are need to be destroy to start a next event. Also to draw attention, stand out to be clear identify and be destructable.
I think i found a pretty nice way to do all of this as you can see in the short video.
Edit:
Added a stand, so the poor flamers do not fly weird in the air