When the military takes the group in, they take Marlena away behind a curtain when
they realize she has been bitten.
We see commotion, hear yelling and in silhouette, what appears to be
someone's head exploding.
In the commotion, it's hard to make out what's going on.
What happened to Marlena?
Did something from the bite cause her head to explode? Was she killed by the military as a preventative measure? Or was that someone else's head that exploded?