Blue light anomaly

⁣Okay, we (my girls and I) were just sitting on the front porch watching the cars go by when I could sense something to my left and immediately got cold chills. So I said, I know you're there, I can feel you and then I heard one of my landscaping blocks move and thought, okay, thats weird and decided to turn my camera on.
Whats odd to me is, I had the camera at arms length and slightly to the right of me pointed where I sensed something and I physically heard a knock. When I reviewed the footage, I hear the knock and see a blue light zoom towards me and sounds like it hits me but, I never saw or felt anything. What caused the knocking sound at the exact moment the blue light appears?
This is only the 2nd time I've caught this 'blueish' light outside, let me know what you think..