The bracelet? *Why would the bracelet make it hard to talk? Unless it did something when he tried?*

When you try to talk, something happens with the bracelet to make you stop. Probably something painful no doubt. So being the intelligent individual you are, you're avoiding that. I don't blame you. *Snake put his left arm around Heiji's waist. At least his brace didn't seem too uncomfortable for Heiji to lean into.*