Noy knowing any more details, I think that the person who energized the circuit should possibly be charged with a serious crime.
In MY mind, you NEVER energize something unless you know where it goes and that it's clear.
Obviously everybody doesn't think like I do.
I don't often follow the LOTO rules but I am always aware and generally work like it's hot, especially in remodel situations. In some cases I use a note, written on masking tape to cover the breaker. In the case of relocating the range circuit, I would have taped up the bare conductors.
In extreme cases where the disco is out of sight and I must make solid contact with conductors etc., I will take more extreme measures.
I have installed a few buckets hot, as not to inconvienence businesses, but it's not likely that I'll ever do it again. It's just too dangerous.
The fact remains that, stuff happens. I don't mind dying but please, NOT at work.