For a few minutes Sam and Frodo are able to rest in their happiness in finding one another again but soon the reality of their situation begins to take hold of them and at the heart of that reality lies one thing above all; and that is the Ring.
When Sam had found Frodo’s seemingly lifeless form lying beside the path after Shelob’s attack he took the Ring and so kept it from Shagrat and Gorbag and ultimately from Sauron himself. For a little while he felt the lure of the Ring imagining himself a great hero but soon saw the fantasy for what it truly was, as a deception that would lure him into the grip of one far greater than he.
The Ring searches out the deepest desire of the one who holds it and then twists it to its own enslaving ends. It is not even necessary to hold the Ring to feel its power. It is enough that there is something in the world that can grant you everything that you desire if only you can possess it. For Gollum the desire is merely fish every day and revenge on all who he perceives to have done him harm. For Boromir the desire is to be the liberator of his people from the shadow of their enemy and to be loved and admired by all. Even the best of desires is capable of being perverted. When Gandalf praises the pity of Bilbo he also recognises that the way of the Ring to his own heart would be by pity.
In what way is Frodo corrupted as the journey continues? We never hear the kind of speech from him as we do from Boromir. Frodo is a true hobbit and not much given to the making of speeches (Bilbo is an exception!). He hears far more than he ever speaks. One thing that he does speak of is his desire to “save the Shire”. As with Boromir, and with Gandalf also, his desire is noble. He also has a deep sense of having been given a task to fulfil, a mission to achieve. He did not claim the mission to destroy the Ring at the Council of Elrond as if it were somehow his right. When he spoke it was as if another voice had spoken through him. His offering of himself for the task came with the deepest reluctance.
The Ring has few footholds into Frodo’s heart unless it is by way of possession itself. Perhaps that is why he sees his kinship with Gollum and pities him. When Sam reluctantly returns the Ring to him Frodo sees him “changed before his very eyes into an orc again, leering and pawing at his treasure, a foul little creature with greedy eyes and slobbering mouth.” Frodo has entered the mean world of the orc and it is horrible.
What is essential at this unhappy moment is that it does not lead to the kind of struggle to the death as it did with Sméagol and Déagol long before. Sam gives up the Ring to Frodo while Frodo himself repents of his accusations against Sam. Both are left devastated by the exchange but their relationship remains firm. Even at the very moment when Frodo sees Sam as a thief the perverted vision does not take possession of him. He remains aware that what he thinks he sees is not real.
“What have I said? What have I done? Forgive me! After all you have done. It is the horrible power of the Ring.”
This ability to step away from the horrible fantasy and to see it for what it is is essential. It saves both of their lives. Frodo must have had practice in being able to step away from his initial reaction to the actions of others and to be able to see that his reaction was not something inevitable and ungovernable but something that he could choose. And he retains enough independence from the Ring to be able to see its power. For the time being it is enough.