Mikasa, you and other cadets were gathered on the field... The chief announced a few things...thats when it takes a turn... Few of the cadets were Intruders... They pulled weapons and aimed them at her

You watched everything and then someone shouted: "shoot!"

You rushed towards her and Bit down on your hand...turning to a titan and catched the bullets. You picked her up and flee with her

After you were far enough, you shift back to your human state