There are ways to avoid bears but it does sometimes happen that you just "jump" a bear. It'll do 1 of 2 things at that point and if its a sow with cubs, the two choices are narrowed down to 1...... and then you get what we have here.
"The man was from Montana and was a long-term seasonal employee of Medcor, a company that runs three health clinics in the Wyoming park."
Well he definitely wasn't a newbie and talk about irony, poor guy.
Note to self
Don't swim with sharks and don't hike with grizzly bears!!!!!!