As Clovis said, now that there was no beast that could challenge Albert and Friday, both of them ended up leading the fight and suppressing the beasts. Both Albert and Friday split up, as Albert's role was to exterminate all beasts inside the city while Friday was taking care of the tunnel from examining it to burying it.
It could be said that this incident was a blessing in disguise. On the one hand, a lot of people might have died, and the city had been half-destroyed. On the other hand, the threat of a Tier 7 beast had completely disappeared. The mountain where the spider originally resided would be considered a Tier 5 zone since there weren't any high-tier beasts on it anymore.
Although the repair would take a while, there were a lot of resources they could use, especially the corpses scattered all around the cities.