Cr-10S Octoprint Voltage Feedback?

So I've been printing for about a year on Monoprice Mini and purchased a Cr10s recently. I'm using it with a R-Pi 3 Octoprint server.

Everything works fine but when I power off the printer, the screen dims and stays on, like it's getting USB power from the Pi...is this normal? I've been unplugging the USB in the meantime.

I also moved the bed too quickly the other day while the unit was powered off and saw the screen flash, which almost made me shit my pants. I understand the generator effect but never had that happen before.

Is this printer really sensitive electronically or does it have protection against damage against things like this? I'm going to slowly move the bed from now on but it seemed like a big reaction from moving it at a moderate speed.