The second picture is nasty. I have been working with electricity half my life, and have NEVER seen a cap blow quite like that. That was freaking bomb! Noticed the others were swollen too. Makes you wonder what would happen if you were standing in front of that panel when it went off.
I have been trained and certified in Arc Flash Safety. I have seen pictures and videos of very bad things that can happen to someone that is not wearing the proper FR protection around live equipment. It is not mandated to wear it, but a lot of larger companies are requiring employees wear it. When I was a maintenance electrician, I wore FR uniforms.