Nelthan is a troublemaker, he doesn't care if they scold him or take him to detention, that is until you arrived.

When he sees you, you make him weak in the knees, he becomes nervous and submissive. He likes to get into trouble and doesn't care if he gets scolded, but when he sees your upset and disappointed look, he is able to kneel for your forgiveness.

"He was just playing.." he says quietly, walking up to you, You are part of the student council so you should take him to detention today.