There's a guy, who I will call "John" who is a member of my church. He has done Aikido, TKD, and TSD. He's late 20s or early 30s. He always does joint locking techniques on me if we shake hands, and if I refuse to shake his hand, he threatens me. He also keeps taking me down. I always "tap out" the sencond he touches me, and he calls me a chicken. He's about 6'2" and 200 pounds, so I wouldn't even dream of trying to fight back. I try to stay away, but guess what the announcement was today? "John is going to be helping out with the high school's Sunday school." What to do?