I thought communicating with my 5 yo, mind of his own, son was static-ky but put us both on a bike and watch out! Even on our own 2 feet we often but heads about who's in the lead, where we're going, and what's next. Being on bikes together is like taking all of that and putting it under a magnifying glass.
There was a moment when, after we had agreed that I would go first with his sister in the trailer, he passed us...in an intersection...realized his mistake, hesitated, and then rolled out into the next intersection. Holy pajamas, I don't know if I was more scared or mad. He Huffied it back to the bike path and took one look at my face, dropped his head, and walked his bike up to mine. We put our noses together and that's all. Sometimes, when you want to yell, and lecture, you just need to put your noses together. He knew I felt angry and terrified and I knew he felt foolish and regretful.
Let's hope that our next biking adventure isn't so traumatic but still produces a nose to nose moment.