Gordon Freeman, in the flesh – or, rather, in the hazard suit. I took the liberty of relieving you of your weapons. Most of them were government property. As for the suit, I think you've earned it. The borderworld, Xen, is in our control, for the time being … thanks to you. Quite a nasty piece of work you managed over there, I am impressed. That's why I'm here, Mr. Freeman. I have recommended your services to my … employers, and they have authorized me to offer you a job. They agree with me that you have limitless potential. You've proved yourself a decisive man so I don't expect you'll have any trouble deciding what to do. If you're interested, just step into the portal and I will take that as a yes. Otherwise, well … I can offer you a battle you have no chance of winning; rather an anticlimax after what you've just survived. Time to choose …
[upon choosing to go through the portal] Wisely done Mr. Freeman! I will see you up ahead.
[upon "refusing" his offer] Well, it looks like we won't be working together. [The player is teleported in front of an army of aliens.] No regrets, Mr. Freeman…