I have several questions
Is he just walking around with emergency chloroform?
Where did he get the chemicals from?
Was he just standing around the Honnō-ji monument with a bunch of chemicals and smoke bombs, waiting for a bolt of lightning to hit him in the ass so that he could travel back in time?
that is a backstory I would love to read
What does he do if Kenshin develops an immunity?
Who holds Kenshin down if Sasuke isn’t there?
What happens if whatever holds the chloroform opens and Sasuke gets knocked out by his own concoction?
Can you just walk right up to him and pilfer his ninja gadgets?
Is there a backup ninja that takes his place?
Sasuke, did you just chloroform a Sengoku warlord!?