Magnus stood up. It was time.
People curiously looked at him, wondering who he was going to challenge.
"Tyrion, you're quite powerful, and you're one of the few young talents of the Blue Swirl Nation. I am just wondering if you are willing to accept my challenge. But of course, it will be totally fine if you don't, it would just be a great shame for me." Once he stepped onto the arena, Magnus encouraged Tyrion. With these 'nice' words, it was more likely that Tyrion would accept the challenge and then he could destroy Tyrion's Primordial Fiendgod body, as he had planned.
Just as he thought, no one found anything unreasonable about his challenge. They could still see the scene where Tyrion defeated Rexis, and had come to learn how talented he really was; maybe he was still too young to confront more experienced fighters like Magnus, but he was definitely qualified for this fight. After all, this is just a performing competition, not some sort of a deadly duel.