Relax, don’t be worried.  You are not permanently stuck in that “No Command” android icon recovery mode screen on Nexus 7 2013.  In order to exit that and boot normally.  All you have to do is hold volume up and power button.  Yep keep holding it for like 1 minute and it should reboot.  The same thing that got you stuck will always get you out. Nexus 7 2013 stuck recovery mode