Sentinel, Genma thinks, and it’s not really a surprise—the Shiranui Clan have always produced about equal numbers of Guides and Sentinels—but… Guide, something in him whispers, and it’s desperate, grasping, clinging to the beat of the man’s heart. Guide, Guide, Guide, and Genma breathes him in, feels the stirring deep in his soul that tastes of old things and instincts and wants to reach—

“There you go,” the voice says, and the hand on Omoi's shoulder loosens. “Okay, how’s the rest?” “Awful,” Omoi mutters, but he drops his hand, lets his eyes slide further open. “I'm going to be the first Sentinel to zone out on dewdrops and then B will be so ashamed of me he’ll shave his head and move to Kusa.”

Tobirama follows Hashirama to the river with a thousand points of light burning in his head. He leaves with one as all he can see, a bonfire, a conflagration. Uchiha Madara sets a match to his life with the simple fact of his existence, and in his wake Tobirama is left standing in a field of ashes.

Kakashi’s senses keep going haywire, and Genma is pretty sure he’s the only one who notices.