If a villager is lynched, you may attack another player tonight.
This counts as a wolf attack.
Question and answers
Will the Ronin's attack be blocked by the BodyGuard?
Yes. The Bodyguard blocks all nighttime attacks.
Does the Ronin attack turn the Lycan?
No. The Ronins attack does not turn the Lycan, since it´s not interpreted as a werewolf attack. Hoewever, a card like The Assassins attack will turn the Lycan