Tennant shoots the lady captive and she falls into the grave. He barely checks on her, and instead of firing a couple more bullets into her body to insure that she's dead, he walks away to taunt the kid.

The lady isn't dead, though (of course). She wakes up and decides to climb out of the grave even though she doesn't know if Tennant is nearby or watching. She manages to get out of the grave while Tennant is babbling on incessantly to the kid (the overly talkative villain trope).

She runs away, but then returns with a shovel and somehow sneaks up behind the gun wielding Tennant and smashes him in the head. He falls to the ground and the woman immediately turns to the kid, who has failed in his previous attempts to rescue her, and angrily berates him (another fave line: "That's how to save someone!")

Of course, Tennant quickly regains consciousness, shoots the shovel out of the kid's hands and chases after them through the forest. Despite being pursued by a gun-toting psycho, the kid stops to try and pull an axe out of a tree stump. He manages to wrench only the handle free, but it comes in handy when the killer spots the lady and decides to take his sweet time before shooting her, which allows the kid to sneak up behind Tennant and beat him into submission.

Then an army of FBI agents arrive very late on the scene after the kid and lady have already dragged Tennant all the way back to his cabin so that they could meticulously truss him up in exactly the same fashion that he did to the woman earlier in the film.

Seriously, you can't make this shit up.