Never had issues with Shunpo (even with pounce on stormblade) when I made the guide but I do know what you mean with pouncezons.
Maybe it's an Amazon thing?
If I remember correctly when King explained it to me back after he was the first to 125 (played Pouncezon for it), it's a targeting issue.
I may be wrong since this is a long ago flashback, but I believe he said that it searches for a target where your mouse is, but if the target dies as its being targeted, or if it moves too quickly and escapes the targeting mechanic, then it will revert and pounce to your most recent target, which, in this case, would be where you're currently standing. That would be why the double pounce happens.
I also believe it's partially from some IAS issue -- either too much or not enough. Look at Panthera's Bite. I used that a few times and when Superbeast procs, you're pouncing 4-5 times in the same spot.
