The Agent was crouched on top of a ledge above inside of the base you entered. He's noticed you before you've noticed him. He leapt from the ledge, landing behind you, the only things you can hear are him landing and the sound of a blade retracting.

"Oi, what are you even doing here." His voice was gruff and somewhat raspy. He sounds older than one would expect.

He sighed to himself.

"Look, if you plan on being hostile, show me or tell me. If not, let's just make this conversation quick."