For example: "The sun was shining" is something he could express.
But "The sun was shining like a ... you know, the shimmering ... the mirror was clear as the day! Oh well I've taken up too much of my time here, that's too much detail."
We've watched the nature of how he loses it over and over ... 2 linked thoughts ok, but if the 3rd must be linked in any way to the 1st, he's lost. He can link the 3rd to the 2nd, but but not back to the first, so the 3rd might link to the 2nd but in the context of the 1st he can't make it all tie together.
There is always the escape and the nervous smile he uses to mask his discomfort -> he knows he's lost it usually. I think they have him jacked up on all kinds of mixtures of uppers and downers ... uppers to make the dang nuerons wake up, downers to keep down the nerves. In addition to looking like an Alzheimer patient, he also looks drug-addled.
Rapid eye blinking at the moment he realizes it, too.
SS1