For about a week the lighter chested of the two fledglings has been sleeping during the day and has had one eyelid closed often (which in the case of a Red-Tail actually moves up, not down). It was also reported to have skipped a few meals.
I hadn't had a chance to get by the nest until today and was encouraged by what I saw. While the hawk still often had one eyed closed, it seemed energetic and ate a rat brought by its mother.
The Urban Park Rangers and the wildlife rehabilitators, the Horvaths know about the situation with the fledgling. The have been getting reports daily from hawk watchers and are evaluating if action needs to be taken. At this point since the bird is recovering and is not grounded, there isn't much action that can be taken.
Park regulations prevent unauthorized individuals from interfering with wildlife. An irresponsible blogger suggested that if the fledgling was on the ground, hawk watchers might want to take matters into their own hands and catch it! Please, please leave this work to those licensed by the state!