Sometimes the prompt to shout "Shaun" shows up and refuses to leave. You can scream it anytime: Ethan yells it at his girlfriend for no reason; he interrupts the villain's evil monologue with "SHAUN"; he hollers his son's name in response to getting shot. Later, as Ethan's lady friend is running from the killer, he keeps screaming "Shaun!" with the voice of a demigod that carries for miles. Eventually, Ethan he recovers from his wound, confronts the killer, and blows him away on top of a construction crane. In the pouring rain, he delivers his badass one-liner. It is, of course, "SHAUN!!!"