Hmm. In Horizons I've fired at the Bug Killer Thargoid with the ship and SRV with no effect to them or me. I do my thing and they just light up
the place for me. Now that Odyssey is here maybe I should fire with my SRV and wait for the Thargoid to complete it's run. Then let's see if
they leave nicely or fire back. I may need another SRV...
Sometimes the Thargoid shows up at the secondary site first. You can sometimes see them on the horizon as they finish scanning then slowly
move to the primary location. Interesting.