Guys, we have no idea if Boba is hesitating from killing a helpless Mace Windu. This is a very truncated trailer, with mixed shots. For all we know Boba never actually captures Mace or any other Jedi. He might be hesitant to kill one of the clones, or a puppy or who knows what? Looking at that shot of Bossk dragging the hostages into the Slave I, I am willing to place a bet. I'm sure Boba will say to Bossk something to the effect of "Put the prisoners in the cargo hold."