If he threatens you then why beat him up? I don't think thats professional. I fucking hate bullies like . If you're threatened by this guy then why don't you ask an adult? People kill them selves because of bullying.
Take this for an example: I saw this video like a day ago ‪Meet Jade‬‏ - YouTube
I'll try not hurting him but if he does annoy me then i guess ill just end up telling on him like he does with alot of people