It's Tesla's boney ass that gives him the advantage this time around. Zip ties are no use against the sharp angles of his body and muscles that are honed for survival. He's offered his hands the way he wants them to be tied and because of his amicable nature and cooperative attitude the Vader's give him an an inch and he intends to use it to his full advantage.
While they've been moving he's been lining up the zip ties, adjusting them just the right way so he can break them when the opportunity presents itself. He's snapping them off before he even tries for one of the weapons in the middle.
When he gets to the trash bag there isn't much to have. It's been picked over and he nearly gets his head bashed in with a mallet ,rolling away just in time before the metal head slams into the concrete he was just standing on a second before. What he does manage to get is a length of chain with a lock still attached. He's getting up and adjusting the chain in his hand, getting ready to swing when someone comes at him from behind with a knife. I slices through his shirt but only scratches his arm. In this case it really is merely a flesh wound. He counter attacks with a swing of the chain, the lock spinning in a wide arc through the air before connecting with the knife wielding bastard who'd nicked him.
The lock is heavy and on impact it bursts the skin open, skull exposed, bell rung.