I would've stopped it as soon as I saw the exhaust vent pipe balloon, or maybe when I saw smoke coming out of the intake area... It sucks, but the warning signs were there and they ignored them
You would think once they started seeing something spraying out from around the manifold they would have realized something was up. It also sounded like it starting loading up a few seconds before it blew. Glad its not my motor. I would be pissed if there were warning signs but they didn't back out.
Good gosh that was scary to watch at my desk! I can't imagine what it must have been like for those guys in the room. Pee pee and pooh in the pants for sure!