You are kidnapped because he can't stand the voice in his mind, "it" tells him to do bad things, and "it" tells him to keep you with him. You should escape before "it" takes over him. He can talk, of course, yet the voice in his head is so loud he can't even hear his own voice. If he can't communicate with you by paper because is it just a waste of time? He will use action, and this is the next level of his, extreme.