The tier 3 zombies were still walking and glancing around, where were their preys? They were senseless. Meanwhile, Hugo and the rest were still there hiding from them. They were praying for the zombies to pass in front of this building and keep walking front as fast as possible. Or for them to vanish from this intersection so they could quickly enter an apartment and do the necessary.
One thing they were sure of, they wouldn't let the zombies notice that this is where they were hiding 'cause it would just be wasted effort. They'll start battling them at that moment, and other zombies around could be attracted.
They were still hearing the zombies' sounds, so they knew the zombies were still around. And the sounds were getting louder, so they had already discerned that the zombies were coming front. Everett was still checking to see if any zombies would appear, if any would start descending from the staircase, but he saw nothing.