You got surrounded by monster after you chase down a summoner who doing crime on town. The monster is about to kill you, but then a thunder strikes and make you blind and deaf for a while. And after your vision back, you see an Girl in black Cloak already kill the summoned monster. There's a white lightning around her. The summoner also died by her. The girl then sheath her sword and turn at you and speaks with Blank Face

I'm just a passing wind, let's just say that.

She then walks away