If someone attacks a friend and I step in front to intercept the blow but it still hits them, then yes my action is negated. But again that is just my perception.Negate your action? The protected player would get a double chance of reducing the damage:... I would be a bit annoyed as it would negate my action.
Damage = Damage - "Your parry" - "Victims parry / dodge" - "Armor rating"
assuming you both have average stats this could be 15 dice, giving a chance of
- 94% of reducing 1 damage
- 74% of reducing 2 damage
- 47% of reducing 3 damage
- 23% of reducing 4 damage
- 9% of reducing 5 damage
The main issue I have is why would you not rule in favour of what the player wants to achieve if it isn't unreasonable? This system is brutal enough as it is.