Having not seen the episode as yet it does seem to raise a question as to whether Barry had lost his speed thanks to the Wells formua or had it just temprarily dampened. That would imply Wells' formula is in fact little more than an anasthetic, which would explain how Zoom so quickly recovered as his metabolism is likely supercharged and burned the serum out in seconds compared to Barrys hours.
But what about Jay? His speed was stolen by Zoom himself? Did Zoom then fail to get the chance to take Barry's thanks to Cisco hitting him with the serum and therefore distracting him from his opportunity?
The serum and its failure is just one more element that makes me question whether Wells and Zoom are really as seperate as we are being told, far too many coincidences and conveniences in Zooms knowledge and awareness of events...
Could Zoom be evil Barry from E2, or else evil dad from there?