This moment, right here. Gabe knows Antonio is right. He knows that they can bring him in, read him the riot act, interrogate him til their lungs are sore and still they will get nowhere.
Because Antonio has Talon at his fingertips. Sure, he could afford a hell of an attorney if he wanted to, but Gabe has already seen what this man can do – first hand. He knows what he is capable of, and he would almost certainly do it again. Why stop at one Overwatch facility? If he was brought into HQ, Talon would have themselves a goldmine. One way or another, Antonio would walk free again, and so many more lives could be lost.
Gabe knows this.
And so, even though it could cost him everything, he pulls the trigger. For Gérard. For the fallen agents. For the greater good.