I am relatively new to BJJ, but come from a judo background. The crossface was not used much in judo (in my experience), so defending it was new to me. I am noticing guys do a lot of crossfacing in BJJ sparring. I know this is fair game & I use it myself. When I crossface, I just put enough pressure across the throat/jaw to make it painful if they try to move or pull me into them, etc. It's not really a choke, just an annoyance. I'm not trying to inflict real pain in a training situation. Some guys I train with will put 100% of their weight behind a forearm across the other guy's throat when trying to pass guard. At that point, you are forced to defend it or be choked out. It can be very painful on your throat/adams apple. The move definitely works, but is this normal to do it 100% in training, or do you guys feel that is a bit too much? Do you guys use this?