Savio watched from a rooftop.  When the zombies first started shambling, he had gone for higher ground and pulled the fire escape ladders up after him.  He was trapped, but unreachable, unless the viral avatars took up skydiving.  He used his vantage point to document what he saw in open messenger.  He didn’t know if he was getting through, but he wrote anyway.  He watched the young woman get overrun, and the boy reluctantly sprint to catch up to the other fleeing woman.  Then he saw a flash in the night and a water tank fell, crushing the zombies below.

Read from the beginning!