How do you suspect the Jedi Council would react to finding one of their padawans using the Dark Side? Specifically Force Lightning?

One of my players is a padawan and I use the optional rule where a Force Sensitive character can spend a FP and use a Dark Side Force Power. However he did this in front of the entire team (the other players) and it will most likely come out after the mission in debriefing. He did it at least twice, maybe three times.

How do you think his master, the other master stationed on their Jedi Cruiser, as well as the council would react?