Why did the crocodile not hurt Bea?

Why did the crocodile not hurt Bea? Billie later speculated that the creature did not harm Bea because she herself was a mutant whose DNA had tampered with, unaware of the pheromones that Jade had synthesized to protect her.

Billie later speculated that the creature did not harm Bea because she herself was a mutant whose DNA had tampered with, unaware of the pheromones that Jade had synthesized to protect her.