With Gaeru steadily working his way up to the main gates, the System was already calculating and readjusting the probability of the frog swordsman's success rate.
The initial plan was to let Gaeru get captured by the Salamanders since Jin wanted the Salamanders to lower their guard. By fighting the only enemy, he hoped that the Salamanders could concentrate their attention on that one odd ball event rather than doing an all scale assault which could spit the enemies up.
He thought that Gaeru would make much of a ruckus to attract as much attention as possible to the Salamanders, giving Jin time to employ the next phase of Operation Gatecrasher.
After all, Jin's goal was the annihilation of the Salamander's family so they could peacefully search and rescue the other village tribes and hopefully prevent a slaughter like what the Salamanders had done to the frogs.