I'm not completely sure, but I think it's something along the lines of a sniper rushing at the enemy.
In other words, it might be a very good surprise strategy, but the instructor who keeps teaching him to stay in the back and, well, snipping is going to be pissed at said sniper.
In other words, it might be a very good surprise strategy, but the instructor who keeps teaching him to stay in the back and, well, snipping is going to be pissed at said sniper.