I think I tried that. Will check again...
EDIT: Yeah I had, it was already set to switchmove. Shooting him doesn't stop him sadly.
EDIT AGAIN: Right, I think I've fixed it. Switchmove to talk, and then switchmove a different action when he needs to shut up, and then he doesn't return to the playmove. Not ideal, because obviously there is a jerk, but at least it works now. Thanks for your help Cheetah.