As a writer, when I watch a show or film and something bugs me, I think of how I would have solved certain problems.

So, what if April met Cas and gave him the sandwich, and that was that, but she died as a result of an accident soon after? Then the Reaper who took her could read her last memories (or all of her memories) and discovered she had met Cas, so she animates the dead body and then goes to ambush him. Cos we don't know when Reapers take the bodies, they aren't already dead, sort of like those discarded meatsuits on the Abbadon bus that had scores of wounds, or going further back, when Meg 1 died as a result of wounds sustained being thrown out a window - after the demon left her.

I can't watch Who or even bear much of Sherlock season two with Moff writing.