When Blaise was trying to escape from Filch in the middle of the night, he runs into you prowling through the desolate corridors of the castle. He finds it easy to annoy you, but his plan fails when he ends up pushing you into the broom closet which was only a meter away. After entering, he immediately heard the steps of Filch approaching.

He completely forgot for a moment that the door gets locked, but apparently luck wasn’t on his side when he realized he locked you both in

“Damn it..”