Ep 484 of Naruto Shippuden. "Exploding people"
Kakashi says "good observation", but neither of them verbally say it. What did Sakura say without wording it?
Kakashi: Whoever did it, the genjutsu is unknown to us. It has to be the work of someone with extraordinary skill. So it will require someone with extraordinary Visual Jutsu powers.
Sakura: looks at Kakashi, startled
Kakashi : (noticing) Good observation.
Sakura : I didn't say anything. blush
Then she punches Naruto offscreen for asking about it.
Kakashi: We might not see anything, but a person with the Sharingan and Rinnegan might.