Awesome! Thanks y'all, those explanations cleared it up for me. I'm going to show this to our DM for clarity if it comes up in the future. My main concern is I didn't think it should have stopped the Cleave, but imposing the -4 for being pone definitely makes sense. I don't know if the NPCs had delayed or readied actions, or what the trigger would've been for them; we just rolled with it at the time since it was just an inconvenience for the Barb.