(no fandom, just an idea.)
There is a distinct sound a sword makes as it leaves a scabbard, reminds me of a tuning fork.
Of course, a samurai swordmaster can free his blade without making a sound if he wished. This one has to be a professional, otherwise he would not have found me.
Just letting me know that he's here, being polite.
I know that there is no more running or hiding. I have tied up all my loose ends and settled all my debts, except for this last one.
Nighttime, everything is quiet. The katana is the last sound that I ever hear.