Interrupts are a really nifty concept. But frankly, they can create issues. For instance-Opportunity attacks interrupt actions. So, if you happen to be able to slide an enemy when making an opportunity attack, you can potentially make their attack invalid. And frankly, that's how it's supposed to work. But occasionally, it becomes a little too easy to invalidate attacks entirely.
Imagine a Knight that multiclassed monk and now has an Abduction Ki Focus. Suddenly, his Knight's Defender Aura can slide enemies if they attempt to shift, or if they attempt to attack anyone else. This can invalidate entire movements. And this is an unbelievably simple combination-requiring exactly one item, and one feat.
Relocating enemies on the battlefield is not a problem in and of itself. Having attacks resolve before the effects that trigger them is not a problem in and of itself. But when an interrupting attack suddenly comes with the promise of enemy relocation, you negate an entire attack. If this is an intended game mechanic, it really seems that the designers intended to sacrifice balance for the sake of "Doing something really awesome."
And make no mistake-it's really really awesome.