I was recently screwing around in ZG on my warrior when i found out, if you engage Jin'do alone and fight him he will use his Brain wash totem and you will get MC'd and go back to full HP, the MC will drop and he will start attacking again. That makes him soloable by any player with a large HP pool, he also drops around 50G so its some easy cash. Not sure how useful it is but I dont think hes supposed to heal you for full.