Agreed! John spent a ridiculous amount of time over the years running off and then being hauled back, so maybe this can be one of the last times (or maybe the last time) and Bobby can be all, "You idiot. Haven't you figured out you can't hide from a telepath?" or whatever. Or they can just be milling around in training and John deliberately tries to scorch Bobby's skin off his bones just for shits and giggles ("I was just trying to help you get better with your own powers, man, don't be such a pussy! Your eyebrows'll grow back!")