The first part is just as easily said as done. The thugs who went off to kill Lou are dead within seconds. The rest is harder to pull off. You're now without cover, forced to back away towards possible help. Luckily, that help exists in a nearby farmhand, and the thugs are taken care of before too long with you still alive at the end of the battle. Unexpectedly quickly, you find Laine. He lets you into the house against Lou's complaints. "Spill it," he orders Lou. "This isn't the first time someone came after you. I saved you that time. What's up this time?" Lou looks as cornerned mentally as he is physically. "Used to be a Stonemason," he mumbles. "Stonemasons Guild turned into the Defias...they want me offed. Good enough for you?" Laine looks a tad surprised, which is more surprised than you've ever seen him look. Apparently, what Lou just said is news to Laine. He doesn't address Lou any further, though. Instead, he addresses you. "You feel like protecting our high-profile target?" he says. "Or do you want to keep investigating? I hear there's something going down at Stormwind's hub here of Sentinel Hill and in what's definitely not their hub in Moonbrook, and I have the feeling that Lou can get you in either place." "Don't know anyone anywhere!" Lou protests. "You just admitted you did ten seconds ago," Laine says, bothering to address Lou this time before he turns back to face you. "Well, kid, what'll it be?"
Protect Lou. Visit Sentinel Hill. Visit Moonbrook.