after he wasnt able to save leo from his face he blamed himself. He saw his brother die.. Who wouldn't blame themselves? You always felt bad sn tried talking about it anytime you could this time.. It was in battle and you got distacted and the villain made the roof colaps onto you as soon as mikey saw the pieces of debree that had inpailed you he froze and started to cry "no.. No... Not you too! Please! I cant lose you too!!" he grabs you and tries to heal you with his powers