Those chairs in particular were cloth-seated... They'da probably burned real nice.
The garage is no longer available for shooting, unfortunately, though I may get another chance or five with the raft at some point. My girlfriend is going to be mad at you when I actually do that now. It would basically just be adding two steps of fire walking... Yeah, damn you Spec, now I want to.
Oh man another idea .... Add the fire and the raft but put a bullseye on the wall. When you go running and jump through the fire do backflips and shit and throw knives while in the air to the bullseye .... that would be epic. Serious ninja shit right there.