Ripperger reaction/ Biblical commentary

Denver catholic exorcist says he talks to Angels and demons, and they talk to him and tell him things...while performing so called exorcisms...Saint Augustine, In The City of God, said that Holy Angels cannot mediate with humans, but demons can. Please Catholic talking heads, explain this away, If I said that in a catholic church now, I would be labeled a heretic!!! I should do a real life hidden camera test of this hypothesis. Augustine was not Roman catholic!!!