Is that Tapi-Tapi? Or is that something else?
Semi Sparring which was the for-runner to the modern Tapi-tapi was a standard box drill which could lead to the random.
The 6-10-8 count drill was taught with each side learning three attacks and three blocks for those attacks and then each side doing them.
Then the students learn to add in one more attack and block for that attack and they both do it.
Then the 8 count shows that only one side is possible to do it.
This means that one can add in any attack and block and go back to the same original box.
Tapi-Tapi removed the low strikes and footwork and focused on the pocket with mid and upper level strikes.
This then lead to the Tapi-Tapi Lock flow.
Note: Right on Right (R-R) can be mirrored with Left on Left (L-L)
Yet Left on Right can be mirrored with Right on Left only not the same as R-R or L-L
Note: Left side wielder usually was considered the driver so that there would be no collision of both going for it at the same time.
When using same side, one would be called out as the driver. The other was referred to as the passenger and the driver led them down the path.
The Random requires one to be able to work with either hand and either one executing the technique.
Yet breaking it down makes it easier to learn.
The drawback to these types of drills as that people think that going fast is better than going at the proper time and being random.
Being fast is fun and can help. Yet it is not the end.
Note: Sinawali's with switching between them can also be a two man drill with countdown call out for the switch to learning to random switch.
This is where the single cane versus double cane comes into play if one did not see it or catch and needs to block and block and then resync to the pattern.
So, Yes Tapi-Tapi and more