https://www.youtube.com/watch?v=2s8c6Ws60kUjust watch 18:10
I don't know what witchery is behind this(I think damage is multiplied over and over),but it's bugged without doubt.
It's not only grasps of the starved, some skills are on the same page(crippling blow, i guess). So it is mechanic problem.
you may think these skills using some exploit that Larian guys encourage to.
But later someday, Modders who want to make balanced new skill and it works in same mechanic in these kind of bugged skills, they just can't do it. Cause they crit like hell.
so I think they should fix this, like reactive shot.