Another hermeneutic of Buddhist Tantric commentaries such as the Vimalaprabha of Pundarika (a commentary on the Kalacakra Tantra) is one of interpreting taboo or unethical statements in the Tantras as metaphorical statements about tantric practice. For example, in the Vimalaprabha, "killing living beings" refers to stopping the prana at the top of the head. In the Tantric Candrakirti's "Pradipoddyotana", a commentary to the Guhyasamaja Tantra, killing living beings is glossed as "making them void" by means of a "special samadhi" which according to Bus-ton is associated with completion stage tantric practice.