Traitor's Choice

Kendall had a difficult decision to make; if he defied the aliens Clare faced a horrible death; if he complied a whole planet must die!
The phonovision bell rang. Reed Kendall reached for the switch, not taking his eyes off the blueprint that lay on his desk. He spoke absently. Yes?
The reply came sharp and cold. I'd suggest you stop what you're doing and pay attention to me.
Kendall raised his head and looked at the screen. The image that faced him was that of a man; a tall man in ordinary street clothes, but wearing an odd silver mask over his face.
Kendall made no effort to hide his annoyance. This was no time for jokes. Some lab comedian with time on his hands. Now listen here! I'm busy and I'm in no mood to—
Shut up!
The tone was sharp, brutal, contemptuous. It stiffened Kendall, then eased him slowly back into his chair. What do you want?
That's better.
Take that absurd mask off.
I'll leave it on.
Then get this over with. Tell me what you want!
It will take a few minutes. Go over and lock your door.