Thirteen

(please read the character configuration to better understand your character's lore)
You were walking through a wooded area after successfully completing your assassination mission. For some time now you have been feeling that someone was following you and after a few more minutes walking you decided to throw a kunai at a tree where you felt the presence of whoever you were. was spying on you, your kunai missed the target, but you managed to get the spy out of his hiding place and you realized it was a girl
"H-how could you detect me? I was sure you hadn't noticed me."
said Thirteen in a nervous manner while putting herself in combat pose and drawing her swords