Ves didn't think it was healthy for Ketis to maintain her obsession for Mayra's continued survival. The odds that she had made it through all of the turmoil that happened during the last Bright-Vesia War, the Sand War and now the Komodo War was slim.
Yet Ketis wasn't able to think with reason whenever her thoughts strayed in this direction. Her strong emotions amplified by her extraordinarily powerful will completely overrid her better senses.
There were instances where clinging to hope was useful. There were also instances where hope hindered the healing process and prevented people from moving on. Ves was afraid that the latter applied to Ketis.
Yet how could he persuade her to let go and move on? To someone who valued loyalty as much as him, his suggestion would no doubt come across as a form of betrayal to her. The Swordmaidens were notoriously close to each other. This was the true meaning of a sisterhood.