The enemy is evaded at all locations unless it says otherwise.

If a "Pervasive" enemy at locations A and B, and I evaded this enemy at location A, will the whole enemy be exhaunted ? Or only the Pervasive enemy at location A be evaded(The investigators at location B will still have opportunity attacks)

This is intentional as a deliberate escalation.

I find the Alien Vibrance and the Blighted Land encounter are too similar.Is this by design? And the Leeched Away or Pulsing Life are too weak I thought.