So today I went to a jiu jitsu club in my area for an open mat. I've been there a few times it's a good place but today I ended up rolling with this 17 year old. He's a tall guy about 6'3 maybe and he's a white belt and Idk but he seems nice enough but in other classes he's made some arrogant big headed comments during classes but anyway o rolled with him and I wasn't going hard I never do when I roll but I was handling him pretty well. I didn't submit him but mostly I was controlling position and one time he tried to reverse me and I pinned that's when I first saw an issue. The look on his face he looked furious like he wanted to hurt me. But whatever I just carried doing what I was doing. Then at one point I went for a triangle and he literally slamming my legs sideways into the mat hard. It wasn't hurting but that aggression was surprising and a few times his elbows and fists were hitting my face. Now once or twice you know that happens in jiu jitsu I get it but this seemed like it was on purpose. Also I'd submitted twice with a push choke from his guard where I stood in the guard and pushed his collar onto the throat and he tapped. Now at that point he was raging no doubt and next time I got Him into guard he literally shook off his gi to so he was in a rash guard. I kind of stopped and said you want to put that back on? And he said no and went for me again. I just carried on I didn't care. But then at the end when the timer bell went he had a sort of hold on my neck it wasn't hurting or choking me but he was cranking it and when the bell went he continued squeezing I told him time was up he kept going. I said it again he kept going. Next time I had to yell and I was ready to stick my finger in his eye to get him off me. I was not happy at all. Because while he didn't have me at that point he could've had my arm or a real choke and if I'd relaxed or stopped and he'd yanked he could've done me serious damage. He did let go and said he didn't hear the timer (BS) I wasn't happy but I didn't say anything because in my eyes there's no need to let bad feelings carry on. But after I spoke to th coach about it and he said yeah the kid struggles with emotions...now I don't know what that means and frankly I don't care if he can't handle his e,options then he shouldn't be on the mat rolling because I can handle myself but if he was against an inexperienced or smaller or younger person and he lost it he could've seriously hurt someone. Just wondering people's opinions.