How do you get flinch in Lego Harry Potter?

Answer:
Make sure you play free play and play the level called "The Restricted Section"

Pick a gringott

Go to the part where Filtch is trying to grab you and strangle you.

Go near the stairs on the right and there is a thing for a gringott to put his key into and that should unlock Filtch when you open it.
Hoped that worked. If it didn't notify me and i will fix it shortly.
First answer by Gabriellahappy. Last edit by Gabriellahappy. Contributor trust: 3 [recommend contributor recommended]. Question popularity: 2 [recommend question].