System Toolkit page 67 offers the Scale mechanics for attacks and defences between different-sized opponents, groups etc. However, I'm not sure how to interpret inner 'or' (i.e. the 'or' within each of the two effects).
Specifically, when it says to apply a bonus to attack or defence, does it mean that only one of the two can be used within the same roll (since one is an attacker and another is a defender), or does it mean that the side which benefited from a +2 to harm done should not receive the harm reduction in the same conflict? (The same question applies to the attack/defence skill bonus.)