MOA arguments aside, imagine yourself in his shoes. Here you are flying with a gucci TCAS system and all of a sudden you get the RA (as e6b mentioned) pretty much saying "you're gonna die." Not only does the safe/unsafe VSI indicator start showing red, but the whole flippin' thing goes red because the other aircraft is intentionally joining up on you. It certainly doesn't provide for a warm and fuzzy. Twice I've had my TCAS go off (correctly) forcing me to immediately climb to avoid the conflict (both times a light GA aircraft passed below us, much too close for the normal "comfort zone.") So if the guy has any experience with a successful TCAS avoidance, then I'm sure he would flip out if a military aircraft decided to join up on him. I remember getting nervous the first time a Hornet joined on me. He saw us the whole time, but in the limited-visibility COD there were several seconds of frantically trying to find the traffic.