While the dragon had said that she wouldn't fight, Crescent didn't budge until reinforcements arrived. Without the shields, which were stationary, they didn't have much of a way to defend themselves if Xenitha rightly thought to change her tune.
When they did, Ashy and his band were escorted out of the caves unthreatened by a squadron of the night's guard. Xenitha barely moved a muscle as she watched them leave. They passed through the tunnels to the entrance without a single interruption, past a glowing rock that Crescent had first seen as the torch.
The mission accomplished, Crescent returned to her chariot and back to Canterlot. She had done it! As soon as she could have an audience with Luna, she did, and told the princess all about it.
Luna was utterly relieved at being told that Ashy and his band members had arrived without harm, and then Crescent told her of the offer to Xenitha, to which she replied, “I will have to consult my sister, but this sounds to me worthwhile.”
Crescent couldn't help but ask, “My apologies, but would that take long? These dragons, while they are terrifying creatures... I pity them for their lot in life, if only for their wretchedness.”
“It is good of you to do so, Crescent, as it shows that you have put yourself in their hooves. That is a valuable skill, and you should never forget it. Do not worry about the dragons, though, as they will all be taken care of from here. After all, I'm sure it shall not take long to convince my sister,” Luna said, her mouth fading to a smile. “Xenitha might ring a bell.”