There are some forms within the postural resources developed by Krishnamacharya that can function as either an Āsana or as a Mudrā. The choice of outcome can be realised according to the specific Bhāvana associated with the intention of the practitioner and the style of performance.
For example if we look at the possibilities around inverted postures interpreted as Āsana through forms known as Śīrṣāsana or Sarvāṅgāsana, we can cultivate the external intensity of Āsana or the internal intensity of a Mudrā through choosing either of two practice directions.
In the former it is the focus on movement of the body through performance of variations on the form that helps cultivates the quality of Āsana. In his teaching Krishnamacharya talked about the performance of 32 variations in both Śīrṣāsana or Sarvāṅgāsana.
In the latter it is the focus on the stillness of the body in order to optimise the movement of the breath through performance of specific breathing ratios in order to lengthen, slow and deepen the breath to between one to two breaths per minute, whilst employing the alchemical processes of Haṭha Yoga, that helps cultivate the quality of Mudrā.
We need to reflect on our physical practice and consider what our short term and long term intentions are within the area of form. Then consider how this intention sits and fits within the larger map of Yoga with regard to the relationship between Āsana, Mudrā, Prāṇāyāma and Dhyānam.