Modern Arnis variation (This drill originally came from Modern Arnis Black Belt Dietter Knuttle)
I've heard it called Empty Hand Tapi Tapi.
It is a 'give and take' drill that develops skill when practiced regularly.
When practicing: Speed and power are not as important as flow and proper relaxation (naturalness, without effort) and of course the regularity of practice sessions and length of time (in years/decades) of time in. There is no substitute for experience!