I am pretty sure you can simply ask him to no longer come in to work, then honor the contractual obligation and be done with it. The whole going to harm someon

I am pretty sure you can simply ask him to no longer come in to work, then honor the contractual obligation and be done with it. The whole going to harm someone part sounds removed from reality. If people are being assholes then make sure you put your foot down and take control of the situation. Mental health problems are not an excuse.