Quote Originally Posted by Assertn View Post
Genjutsu? Really? Genjutsu shouldn't have much effect on Obito's sharingan, anyway. Besides, if it was a genjutsu, why would it show Kakashi's eye tearing up? Obviously Kakashi has been torn about his comrades' deaths for a long time now, and we never heard anything about why Rin's been missing up till this point, so this is the most logical tie to the loose end there.

Kakashi was always fervent about following the rules and placing the mission above all else. Rin must have been compromising the mission somehow. I think I'm going with the "Rin is a spy" suggestion.
I'm going with the spy theory too, but one "weak" explanation for why his eye was tearing up is cause the genjutsu wore off when he struck Rin with the attack and they have been standing in this position for a while. You know ... dramatic effect and all.