Cue the nervous glances! Hank -- sweaty and unsure -- tries his best to case the parking lot without actually getting out of the car. Doing so would only admit that he's afraid something's actually coming. And he keeps one eye on that clock. As long as it stays 3:07, he's safe. So now it's like that Simpsons episode where Marge becomes a cop and has to avoid shooting at Ned Flanders and ladies with baby carriages. Hanks jerks his head this way and that, but he can't get a good look at anyone. Everybody and nobody is a potential threat. He reaches for his gun, but of course it's not there. He turned it in. His hands start to shake. The clock now reads 3:08. Go time!
In the distance, blocked by parked cars, the Cousins advance, then split up, flanking Hank's car. At which point every bald-headed person in New Mexico shows up in the parking lot to be a red herring. And then, through the rearview mirror, he sees Leonel raise his gun and start firing. Without a weapon, Hank guns the SUV in reverse and plows right into Leonel, pinning him against the car behind him, forcing the gun out of his hand and into Hank's back seat. Hank keeps driving backwards, pushing the second car along, Leonel sandwiched in the middle, like the world's most uncomfortable piece of corned beef.
Of course, there's still Marco, who fires a shot through Hank's driver's side window. And keeps firing. Hank's hit in his side (if we're being uncharitable, he's hit in his left love handle, but the guy's going through enough right now without the fat jokes, come on) as he struggles to crawl out the side door. By now the alarm on the car Leonel got slammed into is blaring. Leonel himself looks quite uncomfortable. Marco releases Hank's car, and thus his brother, who falls to the ground. For the first time that we've seen (and maybe not since they were getting almost-drowned by Tio), Marco looks afraid. Leonel looks like he's dying. "Finish him," he gurgles. Marco's got his orders.
Marco follows a trickle of blood across the parking lot. On his right, he hears a mortified, "Jesus!" He turns and fires three shots into the chest of a random shopper. One who apparently didn't hear the multiple gun shots, car crashes, and alarms. From behind Marco, another deaf shopper screams, theatrically throws her hands up in the air, and runs away. Marco goes to shoot her too, but he's out of bullets. Time to re-load, and when he does, that hollow-point bullet the McPoyle gave him falls to the ground. Considering we see it tumble down in slow-mo from a ground POV shot, obviously this is Important.