Thank you for posting Kururunfa, Sanzinsoo. It's one of my favorite kata to watch, but I do not know it yet.
I was surprised to see someone walk through the frame while you were practicing. Maybe seeing someone practice kata is an everyday thing where you live, but I would have stopped and watched you!
Would you mind explaining the moves you do at :53 and :54? It looks like you're dealing with an attacker from behind.
As always, thank you so much for sharing your karate with us. You inspire me!