Board Thread:Questions and Answers/@comment-24507770-20160123121515/@comment-26958085-20160207170232

That's because it is supposed to be stationary. It is supposed to make a little small anti-zombie zone or useful against trapped or other bosses that stay still. Like the Mech, it stops to fire and you can throw an Antidote.

Anyways, the ultimate skills aren't really ultimate. Antidote is just an offensive Biocleanse, Orbital Bombardment is some random, inaccurate artillery, and Assault Team is a small group of 4 NPC soldiers, which are mostly only to clear space so you can run or something.