Good cop, bad cop?
Or maybe 'Mexican wrestling tag team maneuver' is a better metaphor?
Don't even think of responding to SDAI, he's only here to cover the hasty retreat of one of his other Gang of Four alumni. He only shows up when one of them has a bloody nose and has to skulk off and lick his wounds.
If you get into a point-by-point shouting match with him he'll only change the subject, or simply withdraw. Either way you'll have wasted a lot of effort and emotion for nothing.
This kind of troll is best ignored.