Jojo`s Bizarre Adventure Episode 13 Here

Depending on which version of JoJo you are watching, "Episode 13" refers to different storylines:

Santana attempts to retreat into Stroheim’s body to hide from the sun. JoJo`s Bizarre Adventure Episode 13

Joseph discovers that Santana's skin is highly resistant to the Ripple (Hamon) because his cells can absorb biological matter instantly. Depending on which version of JoJo you are

To ensure the creature is destroyed, Stroheim orders Joseph to chop off his leg with an axe so he can move toward the exit. JoJo`s Bizarre Adventure Episode 13