If a combination of reaction and focus reduces the monster resistance below zero, does it count as a bonus to the damage done in the attack?
Example: Frank is about to shoot (bullet attack) and is using his Deadeye focus (reduces the target's bullet resistance by one). Demo guy helps him playing Fire in the Hole reaction, that reduces the target's resistance to zero. If the target has 2 resistance to Bullet attack, does the excess of 1 count as a bonus point of damage done after rolling the dice?
Good question, but no -- resistance cannot be reduced below 0!