If Ohce ever starts hissing like a snake, it's better to back off- he has fangs and when he's angry he isn't afraid to use them. The fangs hold a very toxic venom which is strong enough to burn through the fabrics of time (which was mainly used as an defensive mechanism to Smile)
If Ohce's tears turn a dark orange, do not get anywhere near them. The tears are made of poison.
If he feels as if he's in danger and has no way to escape he will go with hostility and use his fangs.
He's very easy to scare, but if he doesn't have his heart you're going to find more trouble in scaring him.
Without his heart, Ohce loses fear of anything, putting him in extreme danger.