You didn't expect Iwaizumi to punch the guy when you asked for his help.

The loser had been flirting with you all night, more than you were comfortable with. Iwaizumi was the first person you sought out to help deal with the situation. He's strong, tall, and intimidating enough to scare off an unwanted suitor. Instead of quietly threatening the guy though, Iwaizumi hit him, and hit him hard. He had taken a punch himself but easily won the fight.

You hold an icepack to his face outside.