At the beginning of the level, Kostyan spawns between the two pillars in front of the advisory room and the director's room, and plays "Dance of the Sugar Plum Fairies". After Angell has been in Konstantin's proximity and then left it, he will activate and start chasing her.

Kostyan only moves when Angell isn't looking at him. If she looks back at him while he is chasing her, she'll find that he is in a running position. If he gets close enough to the protagonist, he will bite her, causing her 