The first hit was not a core. It was a split.
Btw, the split was pretty meh, those jump kicks get kinda old. The decap, wasn't as bad as you make it seem but not all that great either. High jump decaps look great then they flow, which is fairly hard to do.
A core is a split were you DM both abs/lumbar OR lumbar/chest OR abs/chest in one hit.
An example replay is below.