I would have imagined that if the aircraft was sitting 15(?) degrees nose down with smoke coming out of the engine that you'd leave your bags... Guess you can't model humans!
I randomly keep my passport on me until we are airborne as I live in a part of the world where I figure if you had a problem on departure and ended up back in the terminal with nothing that you'd be trapped forever without a passport. Guess I'm self-modelling and would really also grab my briefcase - and tear the slide as I went down it. Or just sat on it not moving if I'd gone out of L1 in this case...