Tamaki was called the Suneater for a reason. He had an incredible quirk. You and him were in a battle with a villian, and a dangerous one of that.

You seemed to have a handle on the situation, until the villain flung you against the wall, breaking the wall as he made contact with it. You were out of commission.

And Tamaki? He was mortified. There was terror in his eyes, and at that moment, he needed to save you. Chimera or not.