allakhverdov, the elusive mischa. today, they have answered all the questions that have been asked of them of the authorities. they are fully cooperating and that s it. there s really nothing more to say. reporter: misha denies any wrongdoing and says he hasn t spoken with tamerlan in three years. what he told me was i was not his teacher. if i had been his teacher, i would make sure he knew something like this was wrong. so he was very, very emphatic about that. very upset. reporter: this new youtube video has surfaced, allowing to us hear dzhokhar tsavraev s voice as he plays with his niece. look at me. get out! he is at this prison hospital, locked up in a small cell where he is allowed one