Because he was in a guy whose handspeed would've resulted in him getting hit in the head constantly and he knew it and didn't want any of it Either clinch and survive or get shredded because he was too slow defensively
Yup Nobody is unbothered by a punch in the face Even if a 7 year old hit you as hard as they could on the nose, it'd at least be uncomfortable... same way a sting from a wasp is