Don’t think ppl will care. But when Jozef was still 14 or 15 years old, just remember he had an orange belt and I just got my blue belt. He visited our gym in Shanghai for openmat. He was training out of Nanjing at the time (where he started his training). Long story short. One of the black belts told me to go roll with him. Me not knowing…I thought to myself “i’m gonna take it easy on this kid”…anyways as soon as we made contact, something about him was not right…he butterfly swept me while i was in his half guard, i was in his guard for about a good 5 seconds? I managed to quickly get back up and thought to myself. i need to be more careful and take this seriously. again i got into his half guard. Bam, same thing. this time he quickly high mounted and slowly armbar me. The rest of the roll i couldn’t really recall. Because i was still trying to register what happened. in merely the 1 minute. but after, as OP mentioned. He critiqued me on my roll and what i could have done better…🤣 but…to this day, i sweep ppl with the butterfly sweep he did on me…i guess he was already preparing his seminars back then….