I have a series 7 45mm LTE watch, connected to my 12 Pro Max

I was just sitting on the couch with my dog scrolling Instagram when suddenly my watch vibrated so I looked at it and was very confused.

The top and bottom 1/3 of the screen was black, and the center 1/3 was slightly tinted white and kind of pixelating/dissolving into the black. Almost along the lines of like the Star Wars entering hyperspace animation? Might not be the best description but it came and went pretty fast.

It lasted for 2-3 seconds then stopped, no text, no notifications, just that random animation and vibration.

Anyone know what could have caused this? Did I tap something or say something to trigger that? It definitely wasn’t the Siri animation.

Thanks!