They could probably even prorate a player who quits in the middle of a paid semester as well. Make them pay some of it back.
Since Garrett was a walk-on...there is nothing to "pay back"...plus, if a team had a policy like that...good luck getting anyone to sign with you.
Garrett wants a fresh start come Jan at a new school so he can participate in off-season training and Spring Practice...and since his injury back in Sept...he has never been 100% healthy so he will be undergoing a surgical procedure soon so he can heel up and be ready come Spring at his new school.
Wish him the best.