Crazy? No. Just well practiced. What else is he suppose to do with his martial art's skill? Make pottery? Anyways that might come in later. Depends on what you do and what Arms Slave is doing. If all goes well they might be friends. While he is heading towards the Black King, if you can intercept him and convince him of the loot and battles he get with the Ivory Masks, he'll at least fight for you guys. He has a personal policy to not target his friends if he knows them.