I've never ridden in groups outside a handful of organized event rides. For maybe the first time in my life I was tailed by a group on the road this morning. I'm not sure if they came up on me from a distance or turned in behind me. They sure were loud. I couldn't make out everything they were saying, but it was a lot of shouting kind of like in excercise class when the instructor asks each member in turn to shout out the count. I was a little uneasy as to whether they were going to attempt to pass on narrow road with scattered parked cars on right. Then I began approaching an older lady on commuter going much slower. Then I heard someone whistle the wicked witch theme for the Wizard of Oz. Then as I was overtaking the lady, I heard someone else yell almost angry "Pass that bike!" Not sure if they meant me, the lady or both. Then I heard skidding, but no metal on metal or screaming. A quick glance back saw one guy making u turn, then at red light lady passed and turned. In hindsight maybe the skidding was half the group missing the next turn. Anyway will the front guy usually try to give you some kind of indication the group wants by? Should I expect them to behave the same way I would expect a car to behave? And in this scenario there easily could have been passing cars as well.