"Nobody has been arrested or charged in [April's coordinated sniper] attack at PG&E Corp.'s Metcalf transmission substation [in which "snipers opened fire on a nearby electrical substation. Shooting for 19 minutes, they surgically knocked out 17 giant transformers that funnel power to Silicon Valley."] It is an incident of which few Americans are aware. But one former federal regulator is calling it a terrorist act that, if it were widely replicated across the country, could take down the U.S. electric grid and black out much of the country."
He's crucially aware of his breathing rhythm, because he wants to fire between breaths. He probably doesn't think much about trigger pull. He wouldn't be here if he didn't know how to pull a trigger. He's not 'pulling' it in the sense of exerting his muscle against it, so much as urging it to cooperate it, massaging it into doing his bidding.
Is it just me, or did it suddenly get really hot in here?