I've recently discovered that Ein and Hayate share a few similarities......

Hayate's elbow (:right: :right: P)

Ein's elbow (P+K)

Basically these two moves (Hayate's is the fastest) can lead to some good juggles if used accurately. Both moves hit mid and they both deal stun damage/status. Also, from this move alone you can create either low or high chain combos....whatever suits your style of play.

I'd try to rely more on an air juggle such as (Ein: :diagupleft: +K or :diagdownright: +KK). It's sort of a 50 - 50 chance between them, and if your opponent tries to get counter happy...you can always throw them.

Different combinations will make ein's elbow much more effective than the norm, but experiment and see what works for you.