It happens EVERY time... Give a young guy some authority / decision making power and he'll go all in every time.
Literally the exact same thing happened to me years ago at the high school level. The story goes like this:
We were one of the first team's to be running the Shield Punt Pro in Class C... We ran a spread version out of it... Coaches were so befuddled, we literally were never rushed all season... They didn't dare send guys because we could throw quick game and move the sticks. We were actually amazed at how we received no resistance all season.
Last game of the season, for 1st place in our league, we're playing an aggressive opponent... I've got 3 or 4 different punt fakes worked into the game-plan. Our Punter, also our Sr. RB, had the authority to throw seams if the Punt Return team shifted and tried to expose our splits/gaps. Essentially if they rushed more than our protection we would have at least 1 seam running free.
Well, it was a tight ball game, we were backed up in our own territory and the kid wanted to make a play to turn the game... He did not get the look we wanted but threw it anyway. Incomplete, and it was open besides. He came to the sideline claiming he saw the look we wanted, lying like all 18 yr. olds, and we gave them the ball inside our 20...