Im a slow and casual rider, as are most of the guys I ride with, we hate it when the "faster" groups shoot around us like they own the road. Yeah OK the lead guy usually yells out,"on your left!" seconds before he gets to us, and when passing they always get as close as poss to our group. I'm talking within inches. Not saying that your guys do/did that, but something def happened. Anyways here in Philly I have yet to run into a faster group that doesn't do it. Back in the day one of us would always act scared/startled and lean a bit toward them, sometimes they pissed themselves and sometimes they fell, but hey, act like a road hog and you might end up eating a bit of tar. Again, not saying your group practices this method of passing, just sayin'.