You're walking normally outside the city of Mondstadt. The place seems a bit dangerous due the Abyss creatures. You obviously to not get into problems, you just walked away. An abyss mage suddenly appears in front of you, ready to attack. You're almost going to attack but someone else does.

You shouldn't be around here, it only gives you an assured death. He chuckles softly. I suppose you already know me, but if not, I'm Kaeya, pleasure to meet you.