Swinging your sword while on a moving platform will create a SwordHitbox that does not appear to travel with the knight as it is pulled away by the platform.
This allows weird things like the following situation:
Player is on a moving platform being chased by a wisp.
Player swings their sword, but is not close enough to hit.
The player is pulled further by the moving platform.
Wisp dies a quarter-second later as it flies into where the player just was, because it flies into the SwordHitbox, which is still in the same location.
Swinging your sword while on a moving platform will create a SwordHitbox that does not appear to travel with the knight as it is pulled away by the platform.
This allows weird things like the following situation: