T-Minus One

OBVIOUS SPOILERS AHEAD!!! DO NOT READ IF YOU DO NOT WANT TO KNOW HOW IT ENDS

Okay, so you just beat off 50 million striders and now you're back inside with Alyx. After getting on a familiar elevator, you run into the good Doctor, who thanks you for protecting his rocket. Afterwards, you head to the control room to get a good view of the rocket launch. Everyone allows you to press the button to launch yourself, and after a good 30 seconds the rocket launches off in succession. Then everyone heads outside (except Kleiner who has to make sure the trajectory of the rocket is correct) to get a view of the portal closing. But before you can get outside, however, Alyx's dad tells Alyx to go ahead, and he explains that you have to destroy Borealis, and that "our friend" cannot control Alyx. You then head off outside, to see the rocket close the portals with success, and before you head off to the helicopter Dog runs of to parts unknown. Then, after some small talk, you head down an elevator to the helicopter. But, as you are about to board, a Combine Advisor bursts in, and pins you and Alyx against the wall. Eli tries to hurt it with a broken pipe, but it simply picks him up, and as Alyx is screaming, it impales his head with its tongue-like appendage. Then, as you and Alyx are about to be killed, Dog jumps in and scares the Advisors off. The game ends with the screen fading as Alyx says "No...don't leave me...."