Depends on what you call stalling the last 30 seconds. If the wrestler hasn't had any stalling calls, he has the right to hold a good position, have good head-hand defense, and only attack if there is a clear opening. Basically don't force anything and cost yourself the match. As much as we want our wrestlers to bang and attack the whole match, this is also a strategy for the sport. Should a basketball team that is winning drive down the court and take the shot when it isn't necessary and they can let the time run off? Should a football team make a long throw just to try and score one last time even though they are winning?
Yes, if the wrestler is blatantly backing up or running, call it and call it quick that is a gimme. But holding a position and not doing anything dumb is something different. Remember, he is the wrestler who earned the right to control the tempo and the match especially if he hasn't given up a stalling call yet. So many coaches and fans want to act like they got ripped off when this happens. Tell your wrestler not to give up the first 4 points, and this won't happen.