2 of his characters were bot checked, both failed. I sometimes take into account, what accounts are not yet activated (I ban those too) is why they total up to 6. Once again, bot checks are 100% pass or fail. If you're not botting, you'll pass it, if you are, you fail. You don't need to speak or know how to type or anything, it's just a pass or fail pretty much.
Sorry for your loss of your character due to a friend botting if what you say is true, however, that's the risk you take when you bot - getting your friends/family members' accounts banned along with yours.