Since this is a specific effect that modifies a general rule, you need to edit the damage for any qualifying attack: 1d6r<2 re-rolls any 1 or 2 until you get a non-1 or 2 result 1d6ro<2 re-rolls any 1 or 2 once, but keeps the roll even if it is a 1 or a 2. Ignore the mathematical oddity. "<" is not an actual mathematical comparator for "less than", but a way of shorthanding the limit of the target number and pretty much signifies "less than or equal to".