Cuando se dice que dos eventos son independientes?

Alguien me ayuda a dos eventos clave de los tres cerditos en ingles por favor?

“I hope this house won’t fall down! Let’s lean against the door so he can’t break in! ” Outside, the wolf could hear the little pigs’ words. Starving as he was, at the idea of a two - course meal, he rained blows on the…