The AR goggles used by the children have no obvious audio component, yet the players hear and react to sounds within the game. The two sisters who are merely watching don't seem to overhear what's going on within the game, and the players don't use earbuds, leaving no explanation for where the sound is coming from.
At 05:52- All states have provisions that allow or require the courts to treat juveniles in certain cases as adults. Among these cases would be murder and attempted murder. When Eric tried to murder his parents he should have been arrested and jailed awaiting trial.
David suggests the boy may be suffering from "Demonic Oppression", but from his exposition in the previous week's show, that is not one of the 6 recognized types of possession. The closest to it would be "Diabolic Oppression' or 'Demonic Possession".