When a child with autism is driven to the edge, it is by the accumulation of explosive stimuli to which he cannot otherwise respond. The edge to which he takes you, his family, is, at the time, where he lives. You are being taken, in a crisis, to his world - and it is extremely troubling. To cope - at the very least, cope, because this is not sustainable but just an emergency response - you have to somehow ride it out. Getting everyone out of that place, back into the world of the rational, is a distant, secondary goal.