I think that
Why is a good choice to understand what they are doing (it's easier than asking one of likely many threats to "leave"), but I can also see this point in time as potentially being a chance for
Collaborate or
Diplomacy - statistically, we've done a good job and may be able to 'bring it to the table' with the Shiplords. But, likely those options also involve understanding Why to start with...
The other ones I've seen suggested so far are Surrender and some other forms of collaboration. I'm not sure if Surrender is really a great idea... I suppose I should ask if it is even technically possible? With conventional modern warfare, you remove the weapons and people are mostly harmless (yes, there's psychological and other warfare, but..). Potentials.... don't need to be within fist-fighting range to get inflicted with a lot of damage. They could be in a completely empty room with nothing to use as a weapon, and still probably have the capability to destroy a fleet of warships.... in fact, space kinda is a big 'empty' space anyways from our current understanding...
I can only wonder what the perspective of the Shiplords is. If they've never seen speaking before, this may be the first time they've survived to see it. I'm thinking back to the first contact we had with those other space races a while back. Imagine how frightening Amanda must be to the Shiplords if so - she said a word or two and
destroyed part of a fleet of craft. That's a lot of power for one thing, by any standard. We - nor they - seem to know how potent a
conversation could be with such a person. The perspective of the Shiplords would have been an interesting write in actually for the last one... missed chance I guess