If it's a phone that the battery isn't meant to be removed, but can be and you just aren't comfortable doing it then just wait for the phone to die. If it's stuck on the red eye still it will eventually drain the battery. At that point plug it in and then try to boot it up by holding down the volume key and power button. If it doesn't get you to the screen to start in safe mode, un-plug it, let it die, and then do it again.
