Forum:Do NPCs gather new information about your location?

Greetings!

I was playing mw2 career on veteran. When I came to the Favela mission I had fought my way trough most of the level when I stood inside a house and three enemy NPCs came running past. I killed all three, and when I exited the house I got shot and killed by some camper. I respawned inside the same house and went to the same place as last time to kill the three NPCs runnings by. And it worked, I killed them. I killed the guy that killed me the last time to but then I got killed again by another NPC camping his ass of...

I then spawned inside the house and went waiting for the NPCs to run by, but they didn't run by. Instead the had gone around the house, the other way, and shot my trough the window.

By that I wonder if the NPCs gather new information (in the way that they know where I am), the same way I do.

In advance, Thank you very much! :D