Multiple striking in an important concept in Bushi No Te Isshinryu. There will come a time when you are no longer young, or you are weaker (or perhaps weaker) than your attacker. One way to compensate is to use multiple striking. I first learned this drill from Tristan Sutrisno back in 1980. It is worth a lot of practice, I even used to drive practicing this. After about 20 years practice on his drill, I developed two different Isshinryu based ones. I later added an open hand version of the dril.
The point to this drill isn’t that you fight this way, but that any technique can transform into a second technique. Allowing you to be unpredictable to your opponent. A skilled response. Even for the youth and beginners there is a three move version.
Where I have commented on this before, here are those posts.