To be hones with you Bat, I think that 109 was in a stall about the time you got up to him. He was doing about 50 something ias, and he was probably flopping hard to control it. Looks like he got some wind there just as you passed him and he got a lucky shot.
Wayched it externally and from pilot views on both sides..it almost looks like a warp, but the speed of the planes leads me to believe he stalled, auto slats came out and jerked him out of the way just in time and he was able to regain enough control to get some 20's on ya.