Uneducated bafoon standing by a machine that clearly has the potential to cause loss of limbs and/or life. Stupid to not be aware and to take the necessary precautions to prevent this situation from happening. Hopefully a lesson learned for the others present, though I'm sure it will be engraved in their minds.
Too often do people forget and dick around with machines that can clearly crush you in an instant. Not to mention the more basic cases of dickheads in traffic throwing around their 1,000kg+ vehicle thinking they're invincible, or worse, the pedestrians/cyclists who think they can simply take the right of way because a. they think they have the right to, or b. because they think the traffic light grands them some sort of godlike immunity.
100kg of steel versus 100kg of meat is always going to win.