Pretending to deliberate, even feigning another peek, Mera then pointed to Kain's left hand.
"I choose the left hand!"
For the first time, Mera showed an expression of immense confidence.
She was sure Kain wouldn't guess this. So...
Empty.
Mera's face froze, shocked and shattered from within.
Kain merely gently shook his head with a faint smile.
Mera wasn't wrong. It's important to reiterate that.
She abandoned observing Kain's gaze, which meant she discarded a primary clue source that Kain could completely control, preventing him from deceiving and manipulating her again.
Then, Mera chose a new direction: Kain's hands. So, how was this clue different from Kain's gaze?