Yes, but if I recall it was a split second thing and Donaire probably couldn't have seen the glove on the canvas - the ref certianly didn't
This, though the glove that touched was on the opposite side of his body from Donaire, so Donaire may not have seen it. Either way it wasn't terribly egregious and if anything only sped up the inevitable.
At first it looked to me like Donaire was taking advantage, but Arce wasn't quite clearly down yet and the ref hadn't stepped in.
Ref fault for not seeing it ,and beside I said all along this fight was a mismatch somehow the FLASH was going to get him out of there and ARCE knew it. Your the shorter and smaller man and your backing up when you said your going to come forward. After the 1st rd I knew it was over.