Notes for Helm Prominence

===Note on Sangheili hand anatomy===
The saurian Sangheili of Sanghelios seem genetically predisposed to figures of two and four digits in their anatomy. Two hooved/webbed toes on digitigrade (lifted foot, forward-grounded toes) legs. Four fingers per hand, however, these are two extended/pointer fingers and two opposable thumbs, one on each side of the hand offering increased dexterity though the inward/bottom thumb is suspect as anatomically weaker/in genetic decline due to lesser evolutionary application as Sangheili are suspect to have evolved like humans on Earth from four-legged to two-legged/upright mobility in Sanghelios’ genetic history.
However, the two fingers-two thumbs physical structure offers some greater dexterity than human hands with a single opposable thumb and disputably underutilized fingers in our genetical-anatomic makeup. Noteworthy during the Human-Covenant War, Sangheili hand dimorphism was unique among Covenant client species, or rather application as hand structures of other species is as alien to Sangheili or human within their ranks. Sangheili swordsmanship and other hand-focused activity favor center-placement and grip of object application. Wrist and push blades appear early on in Sangheili martial culture; however, such designs were not limited to stabbing and consistently favor slashing motions as well into the contemporary historical era.
It is tangential but noteworthy, renewed research into Forerunner dimorphism revealed artificial induction of genetic drift and manipulation within their species’ civilization and especially for their military rates. But like Sangheili, their hand dimorphism seems to favor two opposable thumbs per hand on each side (top and bottom). Current theory, without strong correlation, suggest a possible evolutionary martial advantage in sapient species to have congruent hand geometry and two or more opposing thumbs.
===Theory on Jiralhanae martial history===