Mike hadn't just been a mentor, he'd given him the man that had killed his wife and daughter. That wasn't something he'd ever forget. "Yeah." Gibbs had to agree with Robin, even if Mike had been a crazy bastard, he was a clear cut good guy.
He gave Abby a look, then that look was turned on Robin. "I've done it five times now." He added simply. He wasnt' going to give away his secret. The only way anyone would ever know is if he was caught in the middle of doing it.