In a scenario where Cal Kestis is portrayed as an Inquisitor manipulated by Darth Vader, it would create a complex and emotional confrontation between him and Cere Junda. Cere, as a former Jedi and a mentor figure to Cal, would likely feel a profound sense of betrayal and heartbreak upon facing him in this altered state.
Cere has significant experience battling the dark side and could be torn between her desire to save Cal and the necessity of stopping him if he poses a threat. The confrontation would not only be physical but also deeply psychological, as both characters would have to grapple with their past connections, their beliefs about the Force, and the roles they now occupy within the ongoing fight against the Empire.
Ultimately, it would depend on the narrative direction chosen by the writers. Cere could seek a way to reach the good still present within Cal, attempting to redeem him from Vader's influence, or she might have to confront him in a more direct and forceful manner if he is too far gone. The outcome of such a confrontation would hinge on themes of redemption, the struggle between light and dark, and the bonds of friendship forged through shared experiences.