In the event this causes grief in the future I wanted to point out the steps to downgrade Windows 10 Mobile build 14295 back to 8.1. The Windows Device Recovery Tool fails to detect the phone without the steps outlined in BrunoTrivellato's response on page 2.
To make this easier, I thought I would repurpose the steps as I can't seem to find an independent or direct link:
Reboot your phone (pressing volume down + home button for some seconds until it vibrates) and immediately plug it back in the PC.