Due to Spill and others' spirit detection, Chen and Lena were able to know, the exact position of the enemy in the dense forest.
Spill was working with Chen, on the other hand, Ai was working with Lena.
Since they knew each other better than other spirits. Also, the Plantation skill was also something Ai had gotten from the record.
Due to this, Ai was able to share that skill with Chen, which has helped him a lot.
Since it was the night period, they had decided to ambush them in which the warrior guy was happy enough, to act as a decoy for them.
So, Chen decided to go with that idea, where the Warrior guy would act as a scout of the main team. In that case, the enemy would try to eliminate him silently. As for that, they would definitely target the warrior guy with the silent assassin.
