Chinese dragons don't have wings... they're more like serpents with dragons heads and 4 feet.
I think the idea was Emma and Regina would try and get the Dragon into position to blast the mirror and it would break. But that it would not have worked except that Henry hit the mirror with the hammer right before. So coincidence...
I quite liked this episode. Did not pause, check email, then resume like I have much of this season. Maybe going in with low expectations because it was an Emma-Regina episode helped.
Loved Hook helping Henry choose the tie!