Shadow Tactics: Blades of the Shogun

The best option: wait until he enters the mansion and remove all the guards, including the samurai. As a result, only two samurai will remain at the entrance. We throw a gas grenade at their feet. And, lo and behold, Yabu comes out of the mansion and is hit by a grenade. We kill the samurai, bring Yabu to the exit of the location, and kill him at the exit. The trick is that as soon as you kill Mr. Yabu, patrols will immediately come out and start looking for you. Accordingly, there is nothing to be afraid of at the exit from the location - the mission will end immediately.