Originally Posted by
WhyFi
No, it absolutely, positively was not directed at you - as mentioned, this is an exceedingly common practice. And people cross over the line all of the time and groups, especially, tend to sprawl over them; "bike up!" was the lead rider's warning to riders behind them to move out of your way, if they weren't already.
I can vouch for this. “Rider up!” is a fairly common warning in my neck of the woods when there is a group approaching an oncoming cyclist in a situation where things could get tight.