Vincent, who had approached with a welcoming smile, stopped short in surprise. A quick glance at Michel was enough to clue him in on the situation.
It appeared that Michel had disclosed to Nick how Alex had successfully neutralized a dangerous backlash of the Desperation Pill with the Nirvana Pill.
Obviously, Nick was here to demand answers! Vincent paused to consider but chose not to intervene. Partly because the matter concerned his daughter, and he naturally wanted what was best for her. Moreover, Alex's assured demeanor suggested a misunderstanding.
Vincent knew Nick well enough to expect a forthcoming apology from him to Alex once things were clarified, likely avoiding any lasting tension.
Similarly, Nick was taken aback by Alex' lack of opposition.