End of class... Free rolling for 90 second rounds. Start sitting on the floor back to back.. no strikes, eye gouges, etc. Just try to get dominance and then a submission. First guy I line up with is at his third class. (I'm at my 5th... both newbies) He outweighs me by a good 120-135 lbs (He's probably 250-260, I'm 135 dripping wet). When the instructor starts the clock we turn around, he lunges forward, grabs the collars of my gi, picks me up, and slams me to the mat. I get the wind knocked out of me, can't get up, and refuse to do anything again with this guy. I sat out the round, then the next round got back in against a guy somewhat closer to my size. I got his back, got a body triangle and RNC, and asked if he wanted me to try to submit him, or let him roll out. He wanted to roll out a bit, so I relaxed, stayed mounted, and fought for an armbar. I could have subbed him, but it wouldn't have done any good for either of us. Letting him get back to where he was mounted and me trying for an armbar was better for both of us then me proving I'm quick enough to get his back. After class, the big guy that slammed me apologized. I reminded him that if we're training together, he's responsible for my safety as well as his own. But I doubt I'll be willing to do much of anything else with this guy again. I've never had issues pairing up with larger people before. I sparred in TKD against more 6', 200 lb. guys than I can count. But we weren't trying to kill each other either.