Thanks KSH.

It was probably a combination of inexperienced riders both doing the wrong thing. I didn't even realize that she was behind me.

It really taught me that you have to be obsessively predictable, even when you don't think anyone is around.

I have done a lot of solo riding or with a few others, but never in a bunch. I suppose it is a skill and like any other you have to concentrate and practise and hope for the best until you get good at it.

I must confess, I haven't done any group riding since.