User blog comment:B214/side series/@comment-5916303-20150204121324/@comment-1359322-20150205021758

Well it's not like Tatsumi immediately become an assassin, he had time to think, plus he actually failed to kill in his first mission, killing the intruders. Tatsumi actually first succeeded as as assassin when he killed Ogre and that was after Ogre taunted Tatsumi.