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"Dude, there's no way! He must've already known the Silk Vine Entanglement before. Otherwise, he shouldn't have been able to master it that fast!"
"I'd like to believe that too, but...you were watching him too; you saw the look in his eyes when he got the skill, and you saw how he gradually increased his control over it within ten minutes after getting it."
"No. Just...no! He's already good at fighting. He can't be that good at learning too; that's just unfair. He's also handsome to boot. He can't have everything. I refuse to believe it."
Conversations like this happened everywhere after they witnessed Cedric clearing the first room within 11 minutes.
Many people refused to believe that he just learned and mastered that skill right then and there. Some people just refuse to believe it.
They don't want to believe it because if they did, it would be the same as admitting their incompetence.