Jack is exulting over what he’s done to Miles but the class does not approve, having finally seen firsthand what their handiwork can do. Jack then goes on to mock their judgment, but in doing so shows they have become the moral compass in him that he’s been trying to rip out of each of them with these Miles Missions. It’s an interesting inversion, one that shows a class can teach a teacher as much as the other way around.
Long version of GIF can be found here.
Right-click to save the GIF. I most certainly do not claim copyright to the material being GIF’d, I’m just doing this as a fan.