To finally defeat Santana, he must be exposed to sunlight. Major Rudol von Stroheim , trapped by Santana's grip, orders Joseph to hack off his leg with an axe so he can reach the sunlight outside. In a final act of nationalistic bravado, Stroheim blows himself up with a grenade to force Santana into the open.
The "Ultimate Lifeform" antagonist with bone and rib-based attacks. JoJo's Bizarre Adventure (2012) (Dub) Episode 13
The episode is noted for its high stakes and body horror, particularly Stroheim's demand to have his leg amputated to continue the fight. To finally defeat Santana, he must be exposed to sunlight
While this means he might not generally hold malice to go out of his way to attack (unless they attempted to stop that curiosity), Reddit·r/anime [Rewatch][Spoilers] JoJo's Bizarre Adventure - episode 13 The "Ultimate Lifeform" antagonist with bone and rib-based
As a last-ditch effort, Santana drags Joseph into a deep well to avoid the sun. However, Joseph reveals he timed the fall so that sunlight would reflect off the water, hitting Santana from multiple angles and permanently turning him to stone.