Can someone explain this?

It just makes me wonder if viola can do this too with her orb.

UPDATE:
WELL, I tried to replicate this in training mode again... and it worked..! I did it three times with a slight difference in the GI animation
http://www.youtube.com/watch?v=AsAy8bnBlRU
http://www.youtube.com/watch?v=TTubCT8KWRI
http://www.youtube.com/watch?v=Uw-HrD56mts

I guess Slade is right (kind of) but the GI shows that Ein hits the front but still, ZWEI can block it.

So I guess don't CE ZWEI's 66A+B...

#NerfZwei2014

It's too bad namco stopped giving a shit about this game xD

Well thats it ZWEI has to be nerfed now

Yeah. There's really no answer for that. Except ZWEI a shit.

Well I just replicated this scenario in training mode and ZWEI gets hit by the CE if he doesn't JG the GI....
I'm still puzzled and in search of answers.

Hooray for detached attacks.
NOT!

Meh.. doesn't it clearly show ZWEI getting staggered by the GI? o_o
ZWEI needs to be nerfed again..

Checked frame by frame; the CE impacted Ein. ZWEI never got staggered by the GI.

I forget if this is normal behavior for 66A+B (Ein being 'detached' from ZWEI in the same way Algol's bubbles are 'detached' from him when they get GIed), but who cares, it's ZWEI.

I would have teabagged at the end of the round

Probably has something to do with Ein hitting from behind instead of in front (Ein is considered a projectile and projectiles have weird properties in this game...)

Also.. Nothing is true; Everything is permitted

It's them damn CaS hitboxes.

o.O????