is one piece episode 615 filler?

As Zoro runs into a corridor that is filling up with Shinokuni, Tashigi tells him he made a wrong turn and decides to go back. Sanji, Robin, Nami and the G-5 Marines sedate the remanding children as Chopper tries to analyse Mocha's condition.

Kin'emon is seen running randomly while Brook tries to reason with him and if he keeps running in that direction, he'll run into the gas. Brownbeard is seen going up some stairs, unable to find his crew in their quarters.

As he heads towards Building R, Room R-66, Usopp exits the mysterious room and finds the door to Caesar's secret lab.