If Hobb was really still alive, then his act of mutilating the young children and throwing the corpses of the dead into the Guardia altar this time was probably because he learned the news that Mobb was in the capital, and was deliberately provoking him or the entire Momen.
Just because the former elder hated evil and hated his hatred, he couldn't hold a grain of sand in his eyes, he was deeply responsible for Hobb's love, and was very annoyed at his self-indulgent practice of blood dark experiments..
He warned him when he was imprisoned in Mocha. If he didn't face the wall in darkness and think hard and change his past, he would gouge out his eyes, so that he could no longer practice this blood act.
Since Momen was known as the number one sect in the world, and Mobb was the highest in charge of Momen clan and was highly respected, Leander did not question his remarks.