During the first fight with Leon, it is possible to defeat him either through cheating or by grinding to at least level 12 beforehand. Beating him will trigger a short cutscene showing a secret ending to the game where Spoiler:Rutee briefly lambasts Leon and then forcibly enlists an upset Stahn to join her and Mary in becoming an infamous trio of globe-trotting Lens hunters, before the game abruptly returns to the title screen. This ending is not featured in the game's PlayStation 2 remake, as Leon's fight is redesigned to be impossible to defeat.
Contributed by MehDeletingLater