That one wasn't called because he let him go "just in time". I agree with the poster who said there is holding on every play, they usually only call the obvious ones that maintain the hold instead of releasing. That being said, stop posting on this site while you are in class and put your phone away. Oh, and make sure you eat your carrots at lunch today...
(ps, OP, I did not mean that as an insult, I was just joking cause you said to explain it like you were 8)