I doubt Norman can cover this... Karla throwing people out of buildings: how will Norman spin this?
I doubt even the "Skrull" or simposter defense will be bought easily after this. Norman would have to kill or brainwash everyone in the office building.
Perhaps this may explain why the "Siege" crossover is happening. Norman fails to cover-up everything and the public finds out.
Granted, I'm guessing it'll be too late when they find out and they'll probably blame the heroes with some sort of "why didn't you tell us we were being idiots?!" scape-goating, but the public will find out nonetheless.