Tenten spots a man on the approach, she does know he is a member of the Leaf, just like she was long ago; though his flakjacket and his headband bring a sense of discomfort to Tenten, seeing as how her fellow villagers are loosing their lifes battling against Konoha just sheer kilometres away.
Hello, Castiel-sama, I am Tenten of Iwagakure; what will you be teaching me? Didn't we discuss this in our letters....Ehh...this one has an even worse memory than Oonoki-ojisan...
Kenjutsu sir, you will be teaching me the ways of weaponry and swordsmanship, which will fit quite nicely with my Bukijutsu in the future.
She scratches her head in disbelief while Castiel-san is looking at her with "wtf am I doing here" facial expression, also scratching his head.