Sometimes when learning something new one reaches a saturation point. People just have to slow down, “do it at the speed you actually can do it without mistakes”, said the best teacher I had. Don’t practice mistakes instead practice playing it right, if that’s very slow so be it, it’ll change tempo later.
In this exercise Mr. B. is trying to play both in 3/4 and 2/4. Using the phrase “not difficult” to remember the feel of the rhythm.
These four jugglers have an imaginary piano between them.