Here I am choosing not to focus on the Pūrva Aṅga, the ascending or preparatory phase, nor on the Uttara Aṅga, the descending or compensatory phase of the Āsana used in the Vinyāsa Krama for the whole practice.
It also does not include the building in of additional techniques such as Prāṇāyāma, nor exploring the different roles Prāṇāyāma may have in relation to the whole practice, especially one that has incorporated additional techniques such as the Catur Bandha.
Instead this extract is an example of the Pradhāna Aṅga or crown of this particular practice. It is centered around a stay in Mahāmudrā of around 10 minutes each side progressively incorporating and building in intensity, within the Vinyāsa Krama for Mahāmudrā, with the additional techniques of the Catur Bandha.
Each step of the Vinyāsa will intensify with the building in of an additional Bandha and also in one of the steps, the intensifying of the breath length and ratio. This example is as taught to me by Desikachar within my 121 lessons, at this particular juncture around the application or Viniyoga of the Catur Bandha, all from the teachings of Krishnamacharya.