is one piece episode 448 filler?

The prisoners race through Level 3 just as Magellan's Hydra catches up poisoning some. Bentham advises not to look back.

Magellan walks through, enraged and covered in poison. The prisoners climb the stairway to Level 2.

After the prisoners make it, Ivankov mourns those who failed. Inazuma and Ivankov stand at the ready with the former using Great Scissors to cut through the staircase and buy some time to escape.

With the staircase cut to pieces, it would seem Magellan has no access to the second level. Magellan roars his Hydra at Ivankov declaring his methods suicidal.