when you're rolling with someone and you have them in a lock right? i noticed that there are certain people who will fight valiantly to get out of the submission. here's the problem: in there head they know we are 'practicing' so they try really hard to scramble out of position. BUT if it was a competition i would probably crank the move harder and get the tap or they will face injury. essentially what i'm asking is, is this common? do guys basically take advantage of the fact you're going to let go cuz they know you won't injure them?