It gets in, it starts growing, it starts secreting its quorum-sensing molecules. It recognizes when it has enough bacteria that now they're going to launch their attack, and the animal dies.
Entra, empieza a crecer, comienza a secretar sus moléculas de detección de quórum, reconoce cuando tiene suficientes bacterias que ahora van a lanzar su ataque, y el animal muere.