What did you choose to do in "Wild at Heart"? (W3)

Spoilers ahead, and a quick summary:

This is the quest you pick up from Niellen the Hunter, in Velen. His wife's gone missing, and he asks Geralt to find her. He's hopeful she's still alive, while his sister-in-law (Margrit) fears she may have been killed in the nearby woods.

While searching for clues in the woods, you can either accept or refuse an offer from Margrit to stop your investigation and tell Niellen his wife is dead.

Assuming you continue, you eventually find out that Niellen is a werewolf, and that he goes deep into the forest when he knows a transformation's coming on so he doesn't harm anybody. Margrit admits that she loves Niellen, despite his lycanthropy, but thought her sister would never accept him if she knew the truth. Margrit claims she lured her sister to the woods one night with the hopes she'd run off upon discovering Niellen's secret, but instead, Niellen ended up killing his wife in a blind rage.

Niellen doesn't believe Margrit's story, and asks Geralt to step aside so he can get his revenge on her.

What did you guys choose to do?

I chose to intervene and save Margrit's life. I felt like she was probably telling the truth, but at the same time, she could just be lying. There's not a lot of information to go on, but I didn't feel comfortable leaving Margrit to die with so much uncertainty.

I was really on the fence on this one, and I'm curious how you guys chose to sort it out.