The way these guys are able to predict movement, even without radar, never gets old to me.
Wait, where does the Waterworks resemblance come in? It's not symmetric, it doesn't even have bases in the traditional sense. Also, from the few times it's popped up in H2V...it's pretty mediocre.Never mind, I figured it out.
It's Uplift. http://halo.wikia.com/wiki/Uplift
Similar to Waterworks and fits the description by bsangel in the bulletin.