If anyone else was here, they'd probably be aghast at the idea of people throwing a bloody warhammer around, but here they are.

Which is fine because Newt easily catches the weapon; using his momentum to swing the hammer one-handed to slam it into the mole as it falls back to the earth. The sound it makes gives him goosebumps and he tries not to think too much on it.

Newt knew that you can't save everyone or every creature, but it was rough to still go through with it.