Yeah, I generally slow down when I see stuff like this, and I did this time too.

Generally speaking, if you have a group split like this, the straggler will go back to the rest of the group, so I figured she'd be going right.

OH ... got passed by a young kid, skinny, in a full kit on a Specialized Carbon of some sort. Not sure what kind of ride he was doing, and I didn't sit on his rear wheel, but I paced him for a couple of miles. He kept looking back to see if he'd dropped me and eventually he sat up and slowed down. Found that kind of amusing as I passed him back