Most people in Tusa's position would be happy.
Not Tusa.
The ace pilot who came back after accomplishing the near-impossible feat of killing a greater phase lord actually behaved as if he did not like all of the honor and recognition that he rightfully deserved!
This was good, because it showed that Saint Tusa's mentality remained relatively pure and simple.
It was also bad, because his lack of appreciation of all of his gains may cause him to miss out on a lot of good stuff.
Ves felt obligated to offer guidance to Saint Tusa so that he would not squander the fruits of this victory.