Moving a person sized body with a bullet just isn't possible (Mythbusters did a pretty good job covering it in this episode).
While it is a good episode of Mythbusters, it is largely irrelevant as a counter argument to Takedown
doesn't throw the guy back several feet, it drops him sprawled in his square, which is exactly what Buster looks like he is doing when he gets shot.
That's due to shock and trauma
And how is shock and trauma not
a Fortitude saving throw?
Fortitude saves are defined (in Spycraft 2.0) as being "used when he resists physical attack or influence, such as a contagion, critical injury, or the concussive force
of some powerful attacks."
Hard armor can exacerbate it: I saw the clip of a soldier in Iraq take a Dragunov round right in his chest plate. Bam, on the ground. Next round he was on the other side of the HMMWV. Damage save made, Takedown failed, both actions to get up and move. (No, the Dragunov doesn't have Takedown.)
Add to the fact that we have a first hand account of being shot equating to being knocked down, from a guy who by all accounts has way
more experience than me on the subject*, and I am not really seeing much merit so far in the argument against Takedown
The one argument I have seen that has had merit is that it increases the amount of die rolls needed to resolve an attack but keeping Takedown
seems to simulate getting shot more than removing Takedown
*I have never had to watch anyone get shot, something for which I am really grateful.