Nibbāna in The Progress of Insight

I was wondering if anyone could help to clearly explain the phenomenology of what happens in this passage from Mahasi's _The Progress of Insight_ , specifically the bolded section: > 12\. Insight Leading to Emergence > > So, through knowledge of equanimity about formations, which is endowed with many virtues, blessings, and powers, he notices the formations as they occur. When this knowledge is mature, having become keen, strong, and lucid, on reaching its culmination point, it will understand any of the formations as being impermanent or painful or without self, just by seeing their dissolution. **Now that act of noticing any one characteristic out of the three, which is still more lucid in its perfect understanding, manifests itself two or three times or more in rapid succession. This is called "insight leading to emergence."** I am interested in all the phenomenology but I am especially interested in the part that says "two or three times or more in rapid succession". Does this refer to mind moments or what?