(He is stammering and putting his emphasis on the wrong parts of words. Obviously from the trauma.) We arrived to find the place just like we were told. It was deserted, doors were wide open.

Don't you get it? We see whatever it wants us to see. You saw Soviet corpses in place of Hurst and the others because that's what it wanted.

From what I read I think it acts like an invitation. Like...the corruption can only infest a place if you open it in that building.