When Alistair returned, her leg was already soaked in her own blood. He asked her what happened but the princess was completely clueless. When she looked at her sword, Ramira discovered that it was her who injured herself by accidentally hitting her leg.
At that time, they already have their suspicions. But first, they treated the princess's wound and stopped its bleeding. Since it was still a mystery why the princess didn't feel any pain in her leg. So without any warning, Princess Ramira slashed her hand in front of them and let her blood drip on the soil.
As expected, she did not show any expression at all. Princess Ramira also told them she cannot feel anything from her wound. For her, even the biggest slash will be nothing now. It also confirmed their suspicions that she lost her sense of pain which is more dangerous because the princess will have no indicator if her life is now in danger or not.