I had one of those in high school and took it with me to a school trip in my back pack. We were at camp (think log houses) for three nights and I started spinning the blade daily. Lots of cuts (mostly on my hands) later I’ve learned to flip it like a pro. I can still do it to this day if someone hands me one. It’s like biking or swimming. Once you learn it, you don’t forget.
The teacher that was with us never said anything besides watching my progress. He was the coolest dude ever. I miss you, Mr Jones.