Here is how Prince Proteus gets back to recovery and battle continues in Yuna and the Return of the Princess.
Sharon looks from Syracuse, She flew to the palace.
King Dymas: Celesita, Is Proteus alright?
Princess Celestia: Almost there, King Dymas.
Then, Proteus opened his eyes.
Prince Proteus: Father?
King Dymas: Proteus, Thank goodness.
Princess Celestia: It's up to us now, Sharon. Star Swirl still needs our help.
Princess Sharon: Yes, Celestia.
King Dymas: Go, Do what you must.
Meanwhile, Grond continues to hammer the gate.
Star Swirl the Bearded: Steady! Steady!
With a mighty crash the battering ram breaks through the center of the gate.
Star Swirl the Bearded: You are soldiers of the twelve cities. No matter what comes through that gate you will stand your ground.
Grond hits the gate once more. It bursts open and in charge Cave Trolls brandishing huge maces. Star Swirl looks alarmed.
Star Swirl the Bearded: Volley! Fire!
They fire into the Trolls and the infantry lower their spears in defense. Orcs advance on them and there is fierce hand-to-hand fighting. The Trolls follow up swinging their maces from side to side sweeping aside all opposition.
Meanwhile, Yuna was about to give up as she and her friends were getting close.
Princess Yuna: (giving up) It's no use, Even if we're about to destroy the amulet, There's no way we'll make it home.
Snowdrop: Yuna, You can't give up! You're my sister! Since my mother died, Luna is now my mother and Hiro is now my father.
Princess Yuna: I don't know If I had what it takes.
Princess Skyla: You do, Yuna. We've accomplish every adventure and became Equestria's greatest Heroes and Heroines since Auntie Twilight and her friends.
The Royal Crusaders: We can do it!
Sméagol: Come, Ponies. Armageddor is very close.
Nyx: You heard, Smeagol, Are we going to do this or not?
Princess Yuna: Alright, Let's do it!
The foals followed Smeagol to Armageddor.
Sharon watches as the battle continues. She, Celestia and Proteus make ready for the attack.
King Dymas: Son, Are you sure you're going to do this.
Princess Sharon: He's well enough to fight again, King Dymas.
Prince Proteus: Don't worry, Father. I'm never alone.
Princess Celestia: My little ones is with Bianca.
Princess Sharon: Hunter will be on his way to help.
Sharon, Celestia, Hunter and Proteus begin to find Star Swirl.