I was kinda thinking the Hurricane was keeping his speed up on purpose.
I've reviewed the speeds between the Hog and the Hurricane throughout the film and frankly, the Hurricane was way faster than he should have been.
The only reason I could think of was that the Hurri wanted a timed reversal that left the Hog right in front of him without much speed advantage. I don't think it's anything too strange - in truth these kind of mistakes are pretty much common in the MA.
Probably the Hurri pilot was pretty much confident that most pilots he would meet in that area would be less in skill than himself, so he takes a 'inferior' Hurri up, and then sees a F4U that engages that sticks around and dares to rolling scissor a Hurricane.
He probably thought it was a good opportunity to get a kill, but if he spent too much E in decisive evasives he won't ever get a chance to down the Hog if it points down and decides to run away.
So I think the Hurricane pulled stunts a bit too close, and didn't realize this was not a normal Hog pilot, until he got the first hit and the damage to the plane forced him to panic or something.
I make that kind of mistakes too. I'm not a good pilot, but if I ever see someone who's seemingly worse than I am, I'd try to "lure" him to latch on to me if I'm in a slower plane.
I'd make half-hearted evasives, thinking the guy behind me probably will not hit me, and try not to maneuver too much, because if my plane is so much slower than him, getting an overshoot won't result in anything, since I still can't shoot him down due to the speed difference.
So, I'd loosen up in the turns, try to seduce the faster plane to lead turn on me, and time a reversal when both of us would be low in speed. A risky business, but it usually works in the MA against the 'seals'.
Ofcourse, from time to time I get to actually meet someone who's not a 'seal'.. and then things would go bad.
I dunno, but I think the same thing happened to the Hurri pilot. I doubt he'd be flying the Hurricane so fast with so loose turns, if he knew that the Hog pilot behind him was very competent.