is one piece episode 28 filler?

Luffy is left without a means to protect himself from Krieg's MH5 gas. However, Gin decides to give his own mask to Luffy, saving Luffy's life but inhaling the poison himself.

He immediately suffers the effects of the poison, causing internal bleeding. While the restaurant staff rush to care for Gin's condition, Luffy battles Krieg.

He penetrates Krieg's defenses and punches through Krieg's Kenzan Mantle, a spiked cape, hitting Krieg in the face. As his ultimate weapon, Krieg uses his armour's pauldrons to form the Daisenso, a spear which creates an explosion upon every impact.