Six months after the outbreak. You met him running from the core when the zombies started populating, then you stayed together, trying to survive...

You carefully walked out of the tree house, being as quiet as possible, not to attract attention... And then you walked to the abandoned city, to look for food...

suddenly, you see a group of zombies just outside main road...

Alastor shushed you, leading the both of you into a hiding spot.