Gittin 66: Demons and Shadows

A series of mishnayot. 1. At first, when someone was to be taken out to be executed, they'd write a get on his behalf, even if he was abbreviated in his instructions. And that was extended to others. Plus, a story about Geneiva - another appearance in Gittin! Also, pre-death gifts in the context of gittin. 2. Concern about shedim, demons, who might trick one into giving a get. 3. A healthy person who designates a scribe to write a get, but doesn't say anything about delivering it - is that mocking the wife or an unfortunate circumstance? 4. Designating witnesses from among a group that include one who wouldn't be a kosher witness (eg, one's son) - how does that work?