Knockback and the purple triangles of doom
Knockback is instantaneous and doesn't stack magnitude.
That's my understanding, at least.
Draggynn on Virtue: lvl 50 Storm/Psi, 1389 badges
Draggynn's Guide to Storm Summoning(Gale-Tornado, updated 6/25/2011)
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Occasionally a team with enough KB can stack enough to throw down such a foe.
It seems more random timing than planned though.

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Whenever you get such a team rolling Fury, count me in.
Hmm...8 force bolts, slotted for knockback, set on auto with a team leader and 7 team mates targetting through him or her.
The leader starts with no target selected, and then, suddenly, clicks on the AV
Would that coordinate the force bolts quickly enough to reliably stack most or all of them?
Fury, I have an all human PB on Virtue that would qualify. If you do this on any other server, I think I'd be willing to roll up a storm/energy defender or an illusion/storm 'troller.
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Also on Virtue. Also have an all human PB. And a WS. And a Stormy Defender (in the mid 20s I think) and I also have a BS/SD Scrapper that is slotted for extra KB in Head Splitter. I love throwing the baddies across the room.
Sounds like a lot of fun
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I'm cogitating an idea of an all knockback super team. Essentially, gathering all the despised (?) energy blasters, Kheldians, storm defenders and force fielders, etc. together and trying hard to scatter anything and everything.
Ideally, this team would be able to stand up to any content in this game, but I'm curious about how knockback would affect AVs. It's trivial for a force fielder to slot force bolt so it has over 50 mag which would mean that it will override the purple triangles of doom and cause an AV to be knocked down/back in one shot.
What I don't know is whether or not knockback has a "duration" of sorts. There's a lot of powers like energy torrent which can be spec'ed to have over 10 magnitude of knockback. Theoretically, would such an application of multiple knockback powers have to occur simultaneously or is it more forgiving and will the magnitude of such powers stack if the powers stack within the duration of a second or two? Consider a full team of knockback specialists all having one or more powers all having a knockback magnitude of 10 or more all spamming their kb powers.
I realize that this is an oddball question, but if you happen to have any insight into this, I'd be much obliged.