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."
*a portal appears*
"Time to choose..."
"Wisely done, Mr. Freeman! I will see you up ahead.