We had a brown beer round our camp t'other year (camping in Northern Greece), fortunately adrenalin kicked in and there was a 3 of us, so we shouted, banged sticks against tress and once it started running away we ran after it 10m's or so with branches from the fire.
After the adrenalin had died down down i have to admit i physically was unable of standing as my knees had turned to jelly
I think that guy had it worse though as he was on his own, and the beer was following him for a fair while.
Tough call though as if it attacks and your on your todd your absolutely screwed.
You can't out run, can't out climb...