The metallic bang bang clearly indicates that my kidnapper is possibly armed, at least with a hammer. If necessary, I could detach one of these stalagmites and use it to defend myself.

I'm really not sure who or what my captor is, and besides, the stalagmites won't allow me to maneuver quickly and safely. So I decide to pretend that I'm still unconscious and to study my captor in order to develop an escape strategy, while I keep the sharp rock hidden behind me.