Jaune just watches as the masked man effortlessly takes on the thief. Honestly, there isn't much he could do, and it looked like the guy had it handled. Still, he feels like he should do something, prove maybe he could be a hero (if only to himself), so he bashes the dazed mugger with his shield, sending him toppling to the ground. When it looks like the man wouldn't get up for awhile (or at least to Jaune it does), he sheathes his sword and turns to face the newcomer.

"Thanks for the help." He holds out his hand. "I'm Jaune."