Despite his trust in Mayumi's prediction abilities, Ron still doesn't believe that Scabbers is alive. Well, partially because Mayumi had always hated Scabbers.
"What about your cat?!" Ron had accused, "Did your cat eat him then?"
"Nonsense," Mayumi slurps her milk carton loudly, "I gave precise orders to Yuzuro— I don't care what he does to him, just don't kill him."
"Plus," She added like an after thought, "You'll regret that later."