Well once Marc runs out of bullets Alida will have to just hand him her gun - which still has about half the ammo - before going back to her baseball-esque method of getting the zombies to stay down.
"It's learning for survival only, I believe." Really, Alida, now is not the time to attempt to go over all the esoteric knowledge you have about Mages and magick and whathave you. "Perhaps whatever is powering them isn't that intelligent to begin with."
Then she notices the ones ganging up on Graves. And the fact that they probably need to be elsewhere. "Can they climb trees?"