What does Mako do?

Mako is a trigger we see in the Border Briefing File, but never on screen. However we have a little more data in it, as in the sealed environment books, a list of the abilities for character in the simulations included a reference to Kogetsu: Mako, so we know it's a Kogetsu optional trigger. The game also interprets it mechanically as inflicting a randomized damage value between certain ranges. This is, as far as I know, all that is known about this trigger.

So, what are all the theories about it?