Can somebody explain to me the whole hologram and Wells duplicating himself part. I didn't really understand what or how he did it when he was talking to Cisco before killing him.
RF can basically vibrate so fast that he can create a the optical illusion of being in two places at the same time. So while he was beating the hell out of himself he was basically throwing punches and then moving so fast that he'd be on the other end of that fist.
In the comics he can hold another image for a while. And even send vibrations through time that can appear as himself.
As far as the machine goes. That was basically all a rue. It was never able to hold a speedster. I'm sure Well's just made the numbers look like they were going to work to throw off Cisco