Bindwa is listed as an enemy ability in the game (not an enemy exclusive ability, like Hewn, both players and enemies can use it), but no enemies in the game use it. Giving enemies different abilities typically results in glitchy messes and rather unsuccessful executions of the abilities.
I gave Bindwa to Sa-Lews...
Success acheived. It worked perfectly. No glitchy messes. It was completely integrated with his graphics like when he casts his other spells (the bottom right orb thingy casts Bindwa).
This has to mean that he was once intended to have Bindwa, otherwise, as he casts it with zero issue. Lots of stuff goes unused in video games, and PSIV isn’t expectation. Pretty interesting to me.