...so they all got wiped out without really knowing what hit them, huh?

[He frowns deeply at that, considering. Guess we've gotten kind of close to that before, he thinks briefly, but it wasn't really the same-- they at least had an idea what was going on, the multiple times the city/world/etc have been at risk.]

And not even knowing how it transmitted meant no avoiding it, I'm guessing. [...] How long did it take?