First off, I respect him as a trainer...even when I disagree with him. I have always felt that he was the bigger talent behind Magpul's training rather than "The Beard."
But this?
OK. He was demonstrating stupid TTPs, on purpose (for educational purposes) to show how stupid they are. I've done that myself and have no problem with that. A "this is what you don't do" sort of thing.
So, when an ND happens, while demonstrating said stupid thing, why in the hell didn't he just say, "See, this is stupid and it even caused me to have an ND."
Had he done that, the only thing someone maybe could fault him for was demonstrating with a loaded rifle.
Personally, that's not a biggie for me because Haley was minding other safety rules in a controlled setting and I know the talent / experience he brings to the table.
Even then, we're all human.
Instead, if you Google some, it seems he completely denies having a ND.
Anyway...
http://bearingarms.com/travis-haley-negligent-discharge/