[Elentári]

Ok, I finally understand it now...and I agree. Even though they all saw it, people react to things in different ways. Frodo couldn't exactly steal it off himself, and he had enough sense and trusted in Gandalf enough to see that to destroy the Ring was the only hope. Aragorn was a very noble person, etc etc, and also trusted in Gandalf's counsel. And he wasn't very human in the book, was he. The hobbits were not fool enough to take the Ring for themselves, and seeing Gandalf fall wouldn't have prompted them to anyway. Legolas and Gimli I guess were a bit more resilient to the lure of the Ring, knowing its corruptive powers- Legolas because he is an Elf I suppose, and Gimli because those Black Riders had been to the Lonely Mountain trying to obtain the Dwarf Rings. Seeing Gandalf perish shouldn't have had that kind of effect on them.
But Boromir had the pressure of his failing city, the pressure of knowing his father would expect him to do his best, his own pride which desired glory, and his slight disregard for the danger in the first place.