How would one power down an Android phone (Moto X 2nd gen - Android 5.1) without the ability to interact with the screen? USB debugging not enabled, nor is custom recovery.

I know how to reboot it, that is not the question. The question is about turning off, not restarting, the device.

The phone has a broken screen (black screen, blank screen, cracked screen) and also does not respond to touch, so the answer should not include any screen interaction.

Is there a series of button presses, timings, and preconditions (if applicable) if executed will leave the phone in a true power off state?