In a recent match I had with my trusty wingman Tegwyn, the following occurred:

I'm in the 'flaming' Yak-3P (having just killed that 109G2, who was stalling at that moment), the other guy in the Yak-9T (not Tegwyn, btw) was the pilot who forced the 109 into stall, apparently. However I, focused in on the 109, didn't see the Yak charging straight up right into my flight path. Luckily, nothing really happened, except significantly raising the pulse rate of certain pilots for a few moments ;)