He was the last to leave when they crossed the snake pit.
Before he left, he checked the rope.
When Pat was crossing the rope bridge, the rope didn't break because he was too heavy. It had been cut with a knife.
The person who cut it was meticulous. The cut was made with precision—others could cross without much issue, but Pat was guaranteed to fall. It would then be passed off as his weight being too much, arousing no suspicion.
In fact, even before crossing the snake pit, Fang Zhen had already narrowed the list of traitors down to two people.
Someone had written to Jorent, trying to persuade him to surrender. Jorent might have wavered, but he definitely wasn't the mole.
Laura gave Fang Zhen the letter, so it couldn't have been her.
With Pat's transparent personality, being a mole would require astonishing acting skills. It wasn't Pat.
Karen had no convincing motive, nor did she have the opportunity to make contact with Ellick.
That only left Gwendolyn and Tos.
