I could save some time and space and just say that Sam walks around a lot. I don’t remember each place that he retraces his steps back to, and it’s all in the dark anyway. So…yeah. Sam walks around. He goes back over (not through) the door that leads to the secret passageway he found, then out to look up at Cirith Ungol. Then he slips the ring on for no apparent reason.
Once again, Sam can hear better, but see less. He hears Shelob gurgling in pain. He hears orcs marching…or fighting, or something. He ducks to the side, but realizes that the sounds are coming from the tower.
Don’t forget, Sam, you’re invisible now. You don’t need to hide on the side of the road. Oh, well.
Invisible or not, Sam can feel Sauron’s will searching for him. You’d think that the presence of the ring would cause Sauron to do some thinking about what his plan is. Hey, remember how Aragorn tricked (well, he will trick, eventually) Sauron into thinking that he had the ring, and was using it to assault Mordor? Well, if Sauron is sensing the ring’s power coming from somewhere around Cirith Ungol, wouldn’t he know that there’s no way that Aragorn has it? I never said I’d answer all the questions, but this very idea: “the malice of the Eye of Mordor, searching,” doesn’t that invalidate what we had known about Sauron’s intent and knowledge up to this point?
Anyway, Sam also reaffirms to himself that he must find a way to rescue Frodo. That doesn’t come without fear, though. Sam sits down to think, or procrastinate, or something like that. We forget that, in theory, Sam could just go on and try to destroy the ring himself. However, he doesn’t. Loyalty.
Days Until The Hobbit: The Desolation of Smaug: 10
No one dies today.
“Then suddenly he realized that it was not so, his hearing had deceived him: the orc-cries came from the tower, who topmost horn was now right above him, on the left hand of the Cleft.”