I had some reservations about the drill method, as well. The videos appear to be drilling the technique, though he may simply be doing multiple demonstrations for a reference reel for his students. He seems to be moving full speed, but his training partner does not seem to be moving at full speed. Also, would have to look really close, but I wondered sometimes if he wasn't responding before the attack. The line can be really fine, and it's a danger in that sort of technique drill. If the partners get to rhythmic or predictable in their timing -- it's easy for them to fool themselves. Somebody described a bit of what I'm talking about in a post recently about using techniques out of kata. (Sorry, time's limited and not going to look for it.) They were drilling a technique, and it was working perfectly. They added an element of randomness, and changed their focus, and it stopped working. Then they stopped trying, and it worked.