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human
[LOTR] How do events play out if Boromir survived?

Let's imagine that most of events of The Fellowship of the Ring takes place. Boromir is tempted by the Ring, he confronts Frodo, causing him and Sam to split, and Boromir comes to his senses, regretting his actions, hears Merry and Pippin in trouble, and goes to their aid.

Here is where things will diverge. Boromir fights valiantly to try and save them, but for whatever reason the Orcs leave with the Hobbits while he is fighting. He gets wounded, but survives as Aragorn arrives to finish off the last of the Uruk Hai.

How does events play out from here?
gpt
Boromir Formally requests help to Rohan so they don't have to wait for the arrow/beacons. Rohan has more time to gather their forces and arrive sooner. This allows Aragorn and Boromit to take command of Gondor's forces. Gandalf now free from stopping Denethor's madness goes to match the witch king and takes him down. Theoden lives and not much else changes.