Yeah ive sparred with a guy like this. He was decieving. He looked all calm and shit and then he went skitso. I wasnt prepared for him to be doing this so it looked like i was getting beaten for half the spar. Then i got sick of him hitting me so when the trainer split us up when he charged in i stood there and hit him with a 1,2 to the face (he nilly cryed lol) then a couple more straight lefts and rights. He then rushed me into a wall but i pushed him away and hit him with a right hook which nilly decked him. He didnt want to spar any more after that. I sparred him once more a couple months later. He rushed out, i hit him with a right uppercut and a left hook and dropped him...........he didnt want to continue . My advice is too move and circle them. Use your jab to keep them away from you.