At high level when 2 people are facing each other, there is no random movement, everything is purposeful.
Not only there are no random techniques but there is no unnecessary movement in the interaction.
When we are advanced it is not only that the technique is stronger and one can produce more force with less action, but that we become more sensitive to the opponent’s movement and intention.
Our ki energy can be projected to the opponent so we need less movement to give threat and break the opponent’s rhythm and the same ki energy serves as our antenna, perceiving the opponent’s energy. At this level we fake or project our energy at the right moment when the opponent has to react, or we can remove, not show our energy, to create emptiness at the opponent and than attack.
I use to spend a lot of time sparring with sensei Nishiyama and sometimes Aiko San without technique, only breathing and feet. This kind of sparring might seem strange at first, but it has amazing benefits. If you wonder, I could never beat neither sensei Nishiyama nor Aiko San, not even one out of ten, but I learned a lot.
One learns to close the gaps and remove spaces in one’s own movement, while learning to detect and anticipate even smallest spaces.
Kumite becomes subtler, and one learns to appreciate the importance of breath in reacting, initiating technique, make fake or set up, and seal spaces in our movement.
One learns that to truly be able to use the breath to do all of what mentioned above, we have to go back to the basics and kata and polish the interaction, of breath muscles and technique.
This kind of training also eliminate end gaining, since there is no technique and you don’t really get each other, it teaches one to be in the moment, and in addition not to rely on quick arm or leg but rather on perfect time and than speed is addition.
Keep in mind, the goal in karate is to remove unnecessary action, make movement more pure, this is true as far as technique and as far as moving with an opponent, therefore learn to move from the inside, fight from the inside.