Masochist?

"Did I see that right? Did this Eren guy also have the Beast Contract Spell from the beginning?"

The match was over. But the audience's discussion about what they had seen was not. One stunned guy asked his buddy standing nearby. The other guy was equally shocked by what he had just seen.

"I didn't even know such a spell existed before. Why would that black hair guy take the beating from Ivor if he was so OP?"

The other guy couldn't help asking. A third guy pitched in to comment.

"That Eren guy's ranking matches always turn out to be like the one we just saw. He gets his ass handed to him by his opponents before he barely manages to score a win."

This guy had seen more of Eren's experiments-centric matches. The first guy who had heard this had a face that said he had some sort of realization:

"Oh! So he is a masochist."