ChibiIceClimberz
Smash Ace
Yeah, but it should make Nana shield instead of a grab.But don't you tilt the control stick anyways to walk the space the downthrow to regrab?....
And BTW this happens commonly on light weights, so when you do b-throw -> d-throw on mid-heavies and fatties, then there's no problem. ;P
Edit...
Tested it; when you tap Z lightly, Nana (partner) does a grab, and when you tap Z normally, Nana shields.
Edit2...
When you grab early after Nana's d-throw, sometimes Nana (partner) grabs and not shields.