The majority of “Crossfire” spends its time between present day and three years ago when Abu Nazir (Navid Negahban) brings Brody to his home to be his young son Issa’s (Rohan Chand) English tutor. There are two distinct, separate storylines in this episode: Carrie’s (Claire Danes) involvement in handling the outrage of the Muslim community after last week’s shooting in the mosque; and Brody’s kidnapping as he goes in and out of consciousness, reliving his time with Issa. And we finally learn what Brody’s mission is as we come to understand the deep connection formed between him and Nazir.