They aren't tracer, they're spotter. They are explosive like incendiary and if struck hard enough could go off. I don't have a live one, just a ball bullet in a short case. You could paint the tip correctly. I wouldn't want a live projectile. When they strike a hard target they erupt with a bright white flash and a loud report. The tracer element of course shows you flight trajectory.
I don't think he was ever in 106 platoon.
The funniest part of that is being that far away gives you all the blast, right on top of the weapon is a bit better, the blast at least goes out back. Regardless, you don't want to be just a few feet away, it's abusive. Yes, if it detonated they'd have gone too.