While the last of the Prodson soldiers exited the tunnel, Oli was already lurking nearby.
Oli was still visible. But his presence was still nigh undetectable while he stood in the shadow of a rock cluster on the other side of the tunnel's exit.
The plan was simple.
By that point, most, if not all of Prodson's perennials should be in combat. That left those potential reinforcements filled with only mortals and hardly anyone to protect them. Of course, Oli couldn't kill an army on his own. But Oli was more than capable of instilling chaos among the ranks while the wildebeests are rushing back to the battle.
As soon as the final Prodson soldier exited the tunnel, Oli waited five seconds. That was more than enough verification considering how frantically the Prodson troops were trying to escape the tunnel's expected collapse.