When there was stretching of the body of Narada Muni from chanting the Hare Krsna mantra, he chanted so loudly that it was apprehended that Lord Nrsimha had appeared. Thus all the demons began to flee in different directions. It is also said that sometimes when Narada, the carrier of the vina, remembers his Lord Krsna in great ecstasy, he begins to stretch his body so vigorously that his sacred thread gives way.