I brought him to a parking lot, did figure eights, stops/goes, starts, etc...for a while then took him onto a residential side street with stop signs. Saw that he was doing fine, I brought him to a two lane road that moves faster, (45mph limit), although definitely not a highway.
We were at the stop sign to make the right and I told him to go ahead of me. He didn't, and motioned for me to go. I pull out and head up and notice in my rear mirror that it looked like he stalled. A mercedenz benz is impatient and goes around him, probably flustering him.
He then makes his right and takes it a bit wide, actually it looked as if he may have crossed the yellow. This prompted a car to swerve, he then laid his bike down, it went under the car but he was able to push off and get out of the way.
This then prompted the involved car to hit two more cars.
While he admits he took the turn wide and that he was completely at fault, I feel like maybe there was something I should have done or rather, maybe I shouldn't have taken him out?
He's fine. Sore knees, but no injuries. He thanks god he wore a DOT helmet cause his head hit pavement.
If I did something wrong, please lay it on me. He keeps telling me he's sorry, but I feel like I failed him.
Thanks for your input.

