Ah, Arby had the syndrome known as Nostradamus Eyes at the end there!
Why did Grant give Alice the gun? He seemed distracted..maybe he recognised the name of the man at the door? If he didn't, that's one rather major question answered...if he did...he gave the gun to Alice as the name of the man at the door was more of a pressing concern and it's about to get very
messy indeed, because...