>>3977720
It's a fantasy the ambiguously brown boy is having.
He's an alien from another dimension that falls in love with the main character's love interest and fantasizes about her being an angel and carrying him away, He challenges the protag to a duel in a jealous rage but ends up enjoying it so much he literally shoves the girl out of the way to congratulate him and then they play out the same fantasy but the main boy is the angel this time.