M9-G8 Astromech Timing

[Vickinator]

Hello.

I was wondering what the conditions for the M9-G8 astromech are? When does the card trigger, is it before the attacker modifies their dice? And if so, can M9-G8 force an attack die that has already been rerolled from a lock or predator as an example, to be rolled again? 

Any clarification is appreciated, thanks.

[AMG_Plummer]

M9-G8 resovles during the Modify Attack Dice step, and the timing within that step is determined by whether the player who is resolving M9-G8's ability is the attacking player or the defending player. The defending player resolves their abilities first, followed by the attacking player.

M9-G8 cannot force an attack die that has already been rerolled from being rolled again, per the "Golden Rules":

"During an attack or while otherwise resolving an effect involving dice, each die cannot be rerolled more than once."