If only they had left, as I had expected them to, this would have all been avoided. I learned something interesting, in that players don't always get what you think is very obvious, and even when I spelled out "if you go with the guards, you will have a trial for murder, and they will find your dark patron, which you know is grounds for execution," that the evil-aligned player would still go along with it.
So now one of them is free, one of them is in jail, one of them is permanently locked in a high tower, to be executed in 2 days. This has become incredibly interesting; and to think, originally I wanted them to leave.
On lighter news, I've also started a second group, running a system called Fate. (I love Fate too, by the way.) This group has been interesting because it's several strangers I've never met. I barely know their real names.
There were some issues from the get-go. Since nobody had webcams, it was hard to tell when people were not paying attention, or just thinking. That was doubly difficult with some people having microphone problems and being forced to communicate by typing. But these players, mostly new to tabletop games, have given me some really interesting stories as well. It's a very different experience as the Dungeon World group.