Saber didn't notice the approach of more Servants at first as she was focused on gauging her opponents' skills. She did, however, take notice as soon as Caster made herself known, followed shortly by—Lancer, perhaps?
Saber sighed inwardly as she backed away from her current opponent.
Regardless of the other Servants' intentions, the fact that she was interrupted when she was about to get a good grasp of the other knight's defensive capabilities was a major setback which Saber wasn't pleased with.
"For you to interrupt us like that. I presume you either have no sense of honor or are eager to go back to the Throne," Saber said in a cold voice as she lowered her sword. "This is not a place where my blade can show its true beauty anymore. We'll continue this at another time, Knight of the Hammer. I hope that you endure until then," she added, dismissing her weapon and throwing a especially scornful glare at the possible Lancer who dared try to flank them.
As long as no one attempted to attack her, Saber would go back to her spirit form and retreat to her Princess' side.
"Apologies, My Princess, my duel against the Ironclad Tyrant had to be called off thanks to unforeseen circumstances. I suggest that we retire ourselves for the night before we attract even more undesired attention," Saber said to her Princess over their telepathic bond.