I've seen people pull the exact same idiot manuever of pulling out right in front of the pack with no motorcycle involved. My favorite is bringing up the back of the pack with nothing but empty road behind me and the idiot has been waiting for the pack to go by then suddenly they decide the 5 more seconds it would take to wait for me to pass is too long so they go right in front of my car. Some people are just idiot drivers, just because their eyes see you doesn't mean the brain does, the one advantage cars have the ability to cause more damage and thus increase the percent chance of their brain seeing you, but it's only an increase not a garauntee.
Unless they're driving an ambulance, I can't understand how that "5 seconds" really benefits them in the long run.
Just jerks, I reckon.
For several years I drove "drag" on a group of 100+ bikes on the way back from the state ABATE party.
If the group had to stop along the road, it was my job to make sure they had clear highway behind them when they started out again.
I also had to stay on their backs when group lane shifts were necessary.
I took "my duty" dead seriously and many times risked my own life to ensure the safety of the group because of cars who would dart around me with only feet to spare and then weave in and out amongst the group.
If I didn't keep right behind them at ALL times, literally scores of cars would pull incredibly stupid and dangerous stunts over the span of the 80 or so miles home.
I have never figured out what was *so* important that you *had* to gain that extra car length or two.