[At a glance, he can tell this young man was used to wielding a blade. It's in the familiar gestures, ones he saw many times before.]

There's likely a main source for them somewhere nearby. If we find it, we can try purging them.

[It's all guesses for him, but he is thinking of typical cliches. What group of beasts wouldn't have a "nest" to spawn from?]

Assuming you wish to join in, that is.