My first clipless fall looked a lot like that. I unclip with my right foot (I lack the range of motion in my left ankle to do it, so it stays until I get off the bike). It's a matter of personal preference.

My boss likes to tell people buying their first set of clipless pedals about it his dad. His dad, despite years of riding bikes, seems to have an unusual talent for ending up on his back (completely unhurt) with both feet still attached to the pedals. No one has been able to figure out how he manages it.