I train sundays with a fast group of racers and occasionally there are a few squirrels that show up--guys and gals who have little or no pack experience (I've found that even folks who are fit or appear that they should know better are riding dangerously). Here's a scenario: there's a pair of wheels ahead of me, side by side. I'm on the left guy, another rider is on my right. Rather than take the wheel of the rider ahead on the right, he decides to ride between the two guys ahead overlapping their wheels by 1/4 or 1/3 of a wheel. There is also a rider to the right of this interloper. Is what he's doing dangerous or am I being too picky? If it's dangerous, what would you say to him or let it go or maybe just reposition myself away from him?