is one piece episode 691 filler?

The arrival of Luffy causes the Colosseum fighters to become more organized in their attacks, surprising the Donquixote agents. The fighters unanimously agree to hold off the Donquixote agents in order to get Luffy, Cavendish, and Kyros to Doflamingo.

Elizabello, Blue Gilly, and Ideo block the soldiers allowing Luffy and the others to move per command by Dagama. Annoyed, Dellinger headbutt-stabs Dagama, shocking Luffy, but Dagama suddenly wraps himself around Dellinger, trapping the Donquixote agent.