Was doing some PL math (why doesn't a l71 rhino charge redemption combo one shot a sharp mage) and the math just didn't come out right sooo...

1) Does the rhino combo make redemption do 2x damage

2) Is 1 armor -1 damage from whatever source

3) The 40% global damage reduction calculated as in a) 40% less damage from all sources (ex. fire damage is reduced by 40%, then buffs, debuffs, crit, and armor is calculated as damage taken) or b) damage is calculated first then reduced by 40% (ex. fire base damage + buffs, debuffs, crit, and armor for damage done then the 40% damage reduction comes in)

4) Is a crit 2x damage

Thank you so much