So I'm watching this video in absolute shock. A blue belt in Bjj being unable to do a basic takedown on a standing opponent despite having ample opportunity. I don't know what the rules were for this exercise, but no one grabbed a sleeve, under hooked, gripped the back of the neck, clenched, went for a single leg, or anything. It seemed like they were all doing some lazy waist grab. So what's the cause of this? Is this all because of sport Bjj, or is something else occurring here?