Is the first/original H3 connected to the internet through Wi-Fi/Ethernet already, with bridging enabled? Because if its not then it cant provide connectivity to the second one (and Joey's). If so, go ahead and leave bridging on the second H3 off, and disconnect it from the internet. If its connected via Ethernet, then you need to pull the Ethernet cable (obviously). Wi-Fi is kinda weird, there is no direct method of making it forget a signal (there is a set of buttons you can press in a specific menu, but I cant remember it right now). What I like to do is just go through the WI-FI setup wizard, and give it a wrong password on purpose, then save. That will kill WI-FI. Then, a network reset to see if it can connect via the primary H3. You do pretty much all this in [Settings > Internet]