User blog comment:KaiserLos24/Yasuo's Assailants- Upcoming Champions (Includng Yone)?/@comment-12049719-20131211103425/@comment-5331854-20131211111535

If he would be someone who would escape battles, then it makes no sense that Yone had to die by his brothers hand, since it's Yone who taught Yasuo about the value of compassion and patience.

His main problem is the asian (read: Ionian) way of handling stuff: If you run, it's the same as confessing that he is guilty. Plus, his pursuers never would give up, because it's a matter of honor for them, too.

Plus, again, look at the asian-style blood splatters. In older pieces of arts from Japan (and Japan is the main influence for Yasuo), if there's that much blood as depicted in the Road to Ruin, then you can be sure that it's a fight where something has gone horribly wrong (or right, depending on the intentions of the involved), meaning death or a gruesome wound that will never heal and cripple the receiver of the wound forever. Mostly it's death, though. (in both cases, this means no champs based on them)

So, yeah. The Ionian way of living and doing stuff is what hinders Yasuo the most in his pursue for truth. Something that made him kill his own brother in the name of truth. If he can do that, then it's not far of a stretch to assume that he killed his former friends, too.