Oh goodness.
Frankly, I'm not sold on either violence or diplomacy; I think that I favor evacuating Simona and Ophelia and then observing what the Cephalopods do.
Like, we can talk to Simona about this after, since she seems to know at least something. And I'm not sure what murder accomplishes here other than escalation for no particular reason, potentially up to "war with the Cephalopods that we cannot win."
Because unless the Ceph are, like, bizarrely bad at record-keeping and general awareness of the disposition of fleet assets, it's not like they're just going to forget that they sent a scout. If we kill the crew and scuttle the ship or whatever ... then what?
To some extent, I'm not seeing a good option. Because, like, if I sent a scout to investigate "lolwut. What caused that massive energy release here?" and then the scout never reports back, I'd send another scout with a better escort, because clearly the phenomenon is dangerous.
And if my scout reports back with "we found the source of the anomaly, only, it vanished," I think I also send more scouts, because that's weird.
... of course, I suppose that it's possible that, due to time shenaniganery, we are still at war with the Cephalopods even 450 years in the relative past and a couple universes over, in which case ... gosh, I don't even know. We're now at a legitimately insurmountable disadvantage, as opposed to the merely extremely large disadvantage Governance had against the Ceph.
I guess ... make peace with the fact that we'll have to wish to stop them, and that Sakura will then feather us to death rather than let us witch out? And then be sad.
...
I am in the middle of a major depressive episode, so if someone wants to chime in with ... less ... bleak analysis of the situation, that would probably be helpful.