@k4k4sh1:
(Hi, new to the forums, btw. Also don't know whether this has been answered, either :\ )
- I don't know why you would think Franky is wondering why Brooke is putting his sword back. The intention for the dialogue seems more like Franky's wanting to say "Where the hell did YOU come from?" and Brooke 's simply telling Franky to chill out for a second. I'm reading straight from the RAW scans, and I don't see anything that suggests that Franky's particularly worried about Brooke seemingly about to get pwned.
I was refering to the following section. From the translation I quoted above.
Franky: おい!!ガイコツ!!
Brook: 。。。えエえエ。。大丈夫です。。もう決着はついてますから
Franky: !?。。。。。
But looking at it again and also reading over Stephen's translation of it Franky's confusion was probably more to what Brook meant by it's already over.
As for Ryuma using the same technique and dealing damage before sheathing his sword, somebody already pointed that out. So although the resheathing likely has nothing to do with the attack, I still think that the sword didn't make any physical contact in its cutting. I believe we'll find Brook's style to be that he uses his sword as a medium to attack his opponents with sound.