Occasionally there’s a bit of lag when first logging in. In the case of my wife, there’s lag no matter where she goes in Stormwind really.
Usually this means her druid leaps into the air in flight form and starts “swimming” to her destination.
In this case her water form didn’t quite catch up to the idea that it was no longer in water.
Unfortunately the same lag that causes this to be possible also keeps us from catching any video.
But this may be a face that only a druidic mother would love.