I tend to feel some of the listlessness and boredom that appears to infect the world that Clarisse sees and tells Montag about. When she describes her experiences when she is watching people and listening on the subway or at a soda shop, it is clear that people are missing something important. She says they talk about nothing all the time, just naming things and saying how great they are. The feeling of emptiness and boredom is palpable.
The urgency of the men leaving for a fire is also very powerful particularly as it is juxtaposed with Montag's thoughtfulness that slows him down and begins to wear away at his reflexive reaction to the bell. The men react so quickly that their cards just fall to the floor and Montag is left there thinking, even if it is just for a moment.
The smell of kerosene also comes on strong as the firemen spray it onto the woman's books and then she lights herself and the whole house on fire.