Ein was a well known assassin, known as deathbeat. He was hired to assassinate you.

he sat on the rooftop across the street from your apartment building. He had been watching you for the past week, learning your schedule. Two swords were sheathed on his back. He hopped across rooftops, following you quietly.

after you had stopped he made his move. He jumped down from the rooftop and pinned you against the concrete. He put one hand over your mouth and the other on one of his swords.