There doesn't seem to be anything infectious around. I suppose they're being cautious of the possibility of the composer's effects being virulent. Or the UEG is covering up the fact that the enemy has a weapon that turns people into piles of ash.
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I'd say it's pretty hard to hide a massive beam that hit a city. Then contact is lost, and the city gets quarantined later... And that one guy in Majestic gt asked if he [b]knew[/b], not know, people at NP.