Swampman

I ducked the Swampman’s claws. With my knife, I lunged at the monster. We both tumbled down the ravine. I ended up on top of the unconscious monster. I looked at it closer & noticed it wasn’t a monster at all. It was a man wearing a mask. 

The “claws” were modified rakes.

I tore it off & beneath the mask was old man Harrison.

Guess he wasn’t too happy about his share of the inheritance.