[It's definitely something that echoes the sickly demon chakra of the tailed beasts, now that Sasuke is taking a more deliberate look, but if it really is something of the ilk, this Ragna guy is doing a better job controlling it in its violent stage than any of the jinchuuriki Sasuke has seen. The eight-tails is the only one on par that Sasuke can recall, and even then the easy flow of one chakra into the demon chakra is so smooth it doesn't seem different at all.
The question of Luka's well-being is (for better or worse) of less immediate concern than that observation, though Sasuke tosses a careless:]
She can probably handle herself if there's any real trouble.
[There doesn't seem anything trickier than these civilian-level sailors, anyway, at least not on the side they're opposing.]
What is that thing? [He asks it after cutting through an advancing squadron, lightning chakra leaving them in a pile of pain. L-Elf will complain about leaving witnesses, but at this point there are so many witnesses there's no point wasting time eliminating some of them.]
D8 DON'T STOP
The question of Luka's well-being is (for better or worse) of less immediate concern than that observation, though Sasuke tosses a careless:]
She can probably handle herself if there's any real trouble.
[There doesn't seem anything trickier than these civilian-level sailors, anyway, at least not on the side they're opposing.]
What is that thing? [He asks it after cutting through an advancing squadron, lightning chakra leaving them in a pile of pain. L-Elf will complain about leaving witnesses, but at this point there are so many witnesses there's no point wasting time eliminating some of them.]