Talk:Ken Kaneki/@comment-66.183.15.32-20170515094024/@comment-181.46.81.202-20170516163612

Because of the plot, I guess. Although tbf, Kaneki is much more sentimental and relaxed around people he knows and has a connection to, which is the excuse I'm making for the Mado punch (although that's also a gag scene) and him getting slashed and stabbed by Mutsuki so many times.

Arima on the other hand was already dead inside. It felt that he couldn't form a meaningful connection with anyone, and thus it wouldn't surprise him if someone he knew were to suddenly attack him, hence he probably always kept his guard up.

Now, if Kaneki is in battle mode, he should be moving as swiftly as Arima, as you saw during his fight with Aura and when he was dodging the V Special Classes.