Did Denethor see Frodo captured in the Palantir?

[FerniesApple]

Fair enough, but Denethor was pretty much teetering on the edge by the time Faramir was injured. So why the sudden collapse of his sanity into madness? Only a person who has been worn down by great peril snaps like that. Before Fara mirs injury Denethor had been in full control of his mind and was defending the city with some ability, he wasnt giving up to despair like film Denethor, so my question is would the apparent 'death' of Faramir, even though it must have been possible to ascertain whether he had a pulse or not, been enough to make Denethor go mad? My view is the long struggles with the palantir corrupted his mind, letting Saurons messages of despair fill him with dread. Denethor was a mortal man and not Young, he was still strong but not as strong as Aragorn mentally. After all Aragorn had experience of toughing it out in the wilds, good battle training, Denethor was used to an easy life in an Ivory tower.