Robin stops. Adjusts his grip slightly on the bo, but doesn't fall into a stance.

He doesn't otherwise move, though, and that is likely... concerning, but he doesn't just try to wait out more information. That's hardly going to work here. If it's not Jason, then it's either a very good imposter or a Jason.

Both options are terrible. His voice, which had been caught halfway between Robin and Tim, drops the rest of the way down into the lower, clipped cadence of Robin. "Who are you?"

You don't have a nice family coffee talking about being Robins - or not being Robins - and then be tell one another 'hate you in the colours.'