Well, there's not all zombies down there... but the thousand-foot-long blasts of purple energy every ten or fifteen seconds, carving runnels down the ground of the Square, make Meluly's position as she tramples through the hordes pretty obvious. She's trying to channel them away from the Basilica, but the problem is that without any actual morale or intelligence, all she can do is vaporize a long line of zombies with each shot, with the rest simply surging in to fill the gaps again.

And the sheer mass of bodies has kept pressing her back, towards the entrance and vestibule. The power armor is strong enough to splatter individual zombies easily, but there's just so damn many of them that she keeps getting tugged along with surges of the mob, able to get herself more firing space only by dashing straight down the gaps the suit's own energy beam is opening.