At the end, Bob/Bruce sees the blue flowers while kneeling, but when he stands up they disappear. Was this a effect of his withdraw from substance D or some sort of device that Newpath used to hide their crops?
The only difference between religion and superstition is the spelling.
Yes it was.
shareWithdrawal. Essentially, a "moment of clarity". The "device to hide their crops" was simply to plant them at the base of a large corn field, so anything flying overhead wouldn't see it.
"I can't be the first person to have difficulty taking you seriously, can I?" - Arvin Sloane
^^^This
It was a moment of clarity where he was actually able to notice that they were there. They disappear, then they are there again, indicating that there is a chance that he might actually recover somewhat. But that the plan was a success.
Dear Vorenus, I don't **** your wife.
-Erinne "Rome"