Initially, Shigure had a dream that everyone sank. (Prob means bad omen or something)
To improve everyone's morale, she asked Katori to "train" everyone.
After everyone's training has be completed, Katori asked for an explanation from Shigure.
After she revealed her intentions, Katori noticed that she was still tensed (prob morale lower than others), she "trained" her.
Morning arrives, Katori leaves and says that she had a dream too. (Prob her sinking in Truk)
Overall, I think that Katori accepted Shigure's request BECAUSE she knows that she is not going to be around for long(?)
I myself think she means there many others like Shigure here though. Of course, herself included but this only means she has been doing good when we were screaming over here and will continue doing it.
The training at this Naval Base is now complete.I shall await the next training session.Well, you're not the only one who's dreaming, you know?The EndI don't know what will happen next, but,