I basically learned this from watching the Rickson Gracie documentary "Choke". It's done from having a guys back & he's tucking his chin, you take the bone of your wrist & lift your opponents chin by applying pressure under their nose. My introduction into grappling was more of a submissions wrestling kind of thing & I was always rolling against much stronger guys than myself, who were trying to maul me most of the time. So when I got into jiu jitsu gym I asked to be briefed about what was okay & I questioned them about this technique & two of the guys said fair game, go for it. So when we begin to roll I get paired up with a blue belt. He's an exact match for my body type & he's good. So long story short, I'm on his back & I use this technique & he was a little upset & felt like I was trying to be a dick. is there a general consensus on this? do I need to stop using this move?