I've had that issue several times now where I was horsing around with xposed modules and rebooting and it would just freeze with the screen super dim and the Verizon logo just barely perceptible. Holding power forever did nothing. One thing I found that ALWAYS recovers it for me is holding power and volume UP for about 30 seconds. It hard resets it. Works every time for me.
I was starting to get scared too as I'm coming from The Galaxy s4 and am used to being able to battery pull.
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality.