Update. The information in this video is not valid, since Valve change everything back to normal 😉
This a video about some of the changes that were left out from the patch notes. This video shows how this one works: A Pyro’s air blast will now extinguish burning disguised enemy Spies, since knockback no longer affects disguised enemy Spies.
You will find all the list here: http://forums.steampowered.com/forums/showthread.php?t=903889
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