Before, you worked for Makarov, and were his Russian terrorist. at this point, you hate him and want revenge. Nikolai, Price's friend, hired you to help them, since Soap was in serious condition after being wounded.

While in India, you were called to help a doctor, but suddenly a helicopter flew into the building.

do what this person says. Nikolai said, pointing his hand at Price, you nodded briefly and went to shoot back. you stood on the balcony, starting to help the guys.