Joslantick, yikes! Let's make sure that we get your device back up and running with no issues. Can you please try to press and hold the Power Button and the Volume Down Key until the device powers off then release (approximately 10 seconds). Keep us posted if this gets you past the red screen.
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Did you have the Dev Preview installed? I think you're supposed to downgrade before you update if you do. This link mentions Cyan, but i guess it would apply to Denim as well.