6 minutes ago, Sparklelord said:That's fair, I was a bit over assertive about the general timing of cancellation. As it turns out, cancelling dice via card text is left out of the Rules reference as a whole (I did check before I posted) and inconsistently applied in all other places.
Things that cancel dice (and when):
-Crack Shot (start of Compare results)
-Bossk (before Deal Damage)
-Wampa (start of Compare results)
-Accuracy Corrector (modify attack dice)
-Ion/Flechette Cannon, Tractor Beam, Ion Pulse Missiles, Twin Laser Turret, Ion Cannon Turret, XX-23 S-thread Tracers (end of Compare results)
And I believe that's an exhaustive list.
But again, cancelling dice is not the same as modifying dice, and because of the Accuracy Corrector example, I put the phrase in "unless otherwise specified". Fact of the matter is, it's always specified when you cancel dice via card text... except in the unfortunate Lt.'s case. A.C. is the only one that doesn't do it in "Compare Results" or later (thanks Bossk), and while that is definitely how it is going to function after they errata it, it's also definitely not how it works now.
Actually it's frequently been unspecified what the timing is for cancelling until subsequent erratas. Accuracy corrector was originally just When attacking and was erratad to specify modify attack dice step. crack shot had to be erratad to specify the compare results step (after first being erratad to the modify defense dice step). I don't remember if wampa needed an errata or not off the top of my head.
During the modify defense dice step is the only timing that makes sense for Kestal to actually have a useful ability