is one piece episode 721 filler?

As Doflamingo calls Luffy to the rooftop, it is shown what happened a few minutes earlier. Trebol used Sticky Launcher to send Law sprawling at the edge of the roof, and he and Doflamingo stood over the severely injured Warlord.

Trebol expressed his surprise that Law was still alive, mockingly suggesting that he give up. Doflamingo echoed his executive's thoughts, telling Law he pitied how everything he'd done - escaping the White City, meeting Corazon, working for 13 years to depose Doflamingo, and his alliance with Luffy - had been worthless.