It's frustrating weekly, but I think this is exactly because of the flashback he had both on the ground tbh. Majority of Luffy fights have more than one round and the flashback was going to break the momentum, so better have them "rest" and start a fresh a new (and likely final) round once the flashback is done.
Yup, i can think of examples where either 1 of 2 things happen:
- A round 1 and 2 separated by flashbacks (Wapol, Enel, Doflamingo)
- A round 1 and 2 (or 3) separated by Strawhat fights (Crocodile, Moria, Doflamingo, Kaido)
This was blatant setup to get both on the ground, get bonney in trouble, and get VP cornered, all to lead to this FB and whatever it pays off to.