The wording I’ve seen for this card indicates that the attack chooses 2 dice to be rerolled...which is different than “up to” 2 dice.
So, if my target rolls only 2 greens and gets 1 evade and one blank, I would have to leave it or compel both to be rerolled. If the target has a focus, they may very well end up with a more useful roll.
If my target has less than 2 greens to reroll, am I able to even use SS rules as written?