A problem in the Front Man's Betrayal

See, the front man took part in the games in season 2. But he is the front man so he can't be killed even if he loses right? Therefore the guards must have known the identity of front man as player 001 so they don't kill him accidentally even if he loses. But in the last fight of Gi hun's team against the guards in which they were killing the guards, the front man was also with their team killing the guards. So, if the guards knew the front man's identity they wouldn't have shot him during the fight even if he was with Gi hun's team. But when the guards saw him fighting with Gi hun and also contributing in killing their fellow guards, how would they have felt? Would they have felt betrayed by the front man as they obviously shouldn't have known that the front man would also be killing them in the fight? What would have happened if a guard after seeing front man killing his fellow guards, shot the front man in self defence?

Also at the same time the game authorities couldn't have risked the front man's life. So, is there a problem with that plot or I'm missing something?