They only do it because they care like have intact structural walls. Enough of the operation is underground that this is a deeply important factor.

Jordan may notice that, in the background, Jenkins has managed to apparently tear one of the dozers in half with his bear hands. Possibly just one - since he's shooting with a gun in the other one.

Missing it would be understandable though, since some of the wall layers are building emplacements to hide behind. That and sending something with their proximity alerts for signalers.

"-.-. --- -. - .- .. -. -.-. --- -. - .- .. -. . -..- - . .-. -- .. -. .- - . - .... . .... ..- -- .- -. ..."

That's, um, probably a bad sign.