Leon knew he had a chance of getting ambushed, the moment he walked out of Zephyr's base. He had already noticed a few suspicious cannon fodder hovering around as if observing him so he tried his luck by discussing his travel route with Jeremy.
Last night he also analyzed the nearby routes finding the best possible place he would get ambushed and where he can set an ambush.
Late at night, using disguising techniques, he sneaked out to prepare the place in advance. He prepared three points to strike in advance.
Due to sneaking out, Leon also managed to save himself from Ye Tian who sneaked into the base to kill him only to find the empty bed of pillows.
Luckily, by the time Leon returned, it was already midnight and Ye Tian had gone back otherwise he would have gotten some nice kill points.
At dawn, he took the most suitable route for ambush, and the other side followed his movements.