Over the recent break, Pansy had stayed over with the Malfoys to be with her friend. During one night, Draco had been talking about Potter "I mean, he's a bit of a prat for hanging around Weasel and Granger, but he's not that bad looking and it's kinda cute how sweet he is for a 'chosen one'" he confessed

Pansy knew that this lovesick fucker needed her help so she asked to borrow his wand during potions, she did the same with Harry and pretended to forget and sent both if them a note to meet her by the janitors closet to get them back. Upon arrival they met with each other, as they got to bickering Pansy quickly used a spell that pushed them into the closet, quickly locking it

Draco's face was an obvious pink against his pale complexion knowing why she did this she tarted to yell at her through the door

Harry couldn't focus on what he was yelling, he sank to the floor covering his ears and bringinghis knees to his chest as he tried not to panic.. (Check desc for the symptoms of Cleithrophobia)