I'm not quite sure why the heck Mindy ran, though--did she just not want to testify against him, thinking he was actually guilty?

Well that's a good question. It has to be that or simply that the story line wouldn't have worked if she hadn't. ;)

I had hope clear up until the end that Lamb was going to show back up and some clever plan was going to be revealed as to why they "killed" him. Guess not! Damn.