First off, my pitiful roll means that Piedra does not even manage to climb the stairs. However, if your giving me a free pass then I won't argue.
Second. Does Piedra have a shot at the two guards he spotted. If so, can he use his crossbow from the steps or will he have to use one of the guns, which he does not trust.
I am a little mystified as to Mellisande's position. Is she still on the ladder? If so, who has line of sight/effect to us (and conversely, us to them)?