is one piece episode 50 filler?

Usopp enters a shop in search of a pair of goggles, but gets into an argument with a little girl, Carol, over a particular pair of goggles. Carol purchases the goggles for her father, infamous sniper Daddy Masterson, and Usopp, unaware of Daddy's identity as a feared bounty hunter, gets into a dispute with him.

Daddy recognizes Usopp from Luffy's wanted poster. Usopp and Daddy agree to solve the dispute with a duel to the death.

The citizens of Loguetown gather to watch the duel, but Usopp cowardly attempts to flee from the duel before completing his ten paces.