A man steps out of the cupboard - somewhere between forty and fifty, well-dressed by Muggle standards, with a passing resemblance to Feral and an expression of cold anger on his face.

Feral flinches back.

The Boggart goes up in flames with an unearthly scream. The cupboard does likewise, unearthly scream not included.

And Feral spins around, snarling, to give the teacher a venomous glare.