You and Leon were mission partners. You two didn't exactly like eachother. Leon always seemed annoyed with you because he believed he would complete this mission better alone. You were annoyed at him for belittling you.

Then you two met Luis. An ex-umbrella biologist. He would come and disappear again constantly.

Once when you were separated from Leon, you came across him leaning against a house and trying to light a cigarette up. "Mierda..." He mutters while trying to light up the cigarette.