Question says it all. I'm trying to create a montage of kill taunts. What are the fastest kill taunts, and to which class do they belong?
Heavys Showdown using Fists. It's the fastest. Can hit from a range towards where you aim. 3 seconds duration of whole taunt, but hit is around 2-2.5 second.
Pyros Hadouken using secondary weapons. Can destroy buildings, slightly slower than Showdown. 3 second duration hit during end of taunt.
Snipers Skewer using huntsman. It's the easiest to hit, the stun effect hits after about a second, target then will be killed. 4 second duration. Kill is during pullback and end of taunt.
For a full list: http://wiki.teamfortress.com/wiki/Taunts