Last night at bjj practise, My last sparring was with this guy who is rougly the same size as me (6'1' 200 lbs).I am a four stripe blue belt and he is a three stripe white but who has freakish strength and is very aggressive. We went at it normally but i noticed that he was extremely stiff and wasn't trying much and was staying in my guard. I caught him with a triangle, this guy lifts me up in the air , and I tell him" No slamming" .So basically he violently opens my triangle and drops from the top. He didn't slam. When I fell, I was pissed. I was like" what the fuck? you can't just drop me like that! U have to use technique" . The guy didn't apologize. So we continued. I sweeped him and passed his guard, put a knee on stomach and was working for a lapel choke. Unfortunately time ran out. At the end I pulled out my hand and he didn't want to shake it. The way I see it the instructor should tell him off for this kind of behaviour but he didn't. That's not normal. I have two views, either I don't spar with him anymore because it isn't interesting to work with someone who is clearly a bit deranged. Or fuck it it is a good way to test myself with someone who goes overly hard on me.What would you guys do in this situation?