Head Case - Headless Dad? What Does it Mean?

Dad was feeling unwell and as he walked through the house, past one of our static cameras (filming the area because of previous activity), his head seemingly dips in and out of 'phase'.

At first we thought it was a camera glitch, but that's impossible as you can clearly see through Dad's head multiple times. Whatever glitch occurred, if it was a camera glitch then you wouldn't be able to se through something that was solid!

Dad had a bad headache like a migraine, dizziness, and tunnel vision.