Oh, there were legs! Barty was a ways away but in sight. If, generally, sight were how they were dueling. Silent, Barty quickly cast petrificus totalus silently, hoping the crazy sounds of the exploding bookcase would delay the man's reaction time. But not wasting any time, he cast magical ropes immediately after. But then he swiftly rolled out of where he was, a couple bookcases away and caught his breath.