Ahhhh, I see now. I quote myself with "Why am I so blind?!"

Anyways. Based on the data provided previously, I assume they don't move, as previous teams have been corralled into their kill zones. However, this is an assumption. I also support this thought with the way it drops and forms and it's placement in the very center of the map, where it can do the most autonomous damage. We also don't know yet if it doesn't do anything without being targeted first either. It could just be charging up a slow charge.