...If they hadn't shown it a thousand of times before the show, I would have never thought Meatloaf would explode like that...
What fs said.
I've seen one or two biographies on Meat Loaf. He's had problems like this in the past and were it not for the anger management he's already had probably would've exploded even worse than that. Been known to blow up and/or completely lose his voice before concerts all of it is emotionally based.
The suddenness of his outburst was freaky to watch. His apology to Gary was heartfelt and I think he knows how badly he behaved.