Luffy starts to fade out of Gear 5, allowing his injuries to truly take effect

Luffy just stated that the only reason he's able to keep fighting with his injuries is because he's in Gear 5, but eventually, he will have to exit out of Gear 5. When that happens, it will force the other characters such as Usopp, Chopper, Ragnir, etc... to jump in and save him. This would also set up a good Usopp observation haki moment, where he can sense that Luffy is in danger.