Paladin Charges

Against Empress Cygnus or any other mob who is elemental-resistant, how do we calculate damage against those mobs using Dual Charge? (Lightning + Divine Charge)

Divine Charge gives you 150% multiplier
Resistance halves it to 75%

Lightning Charge gives you 140% multiplier
Additional Multiplier would be (140-100)% /2 = 20%
Resistance halves it to a further 10%

So resultant multiplier would be 85% yes?

EDIT : What is the success rate of Threaten?

EDIT 2 :

It would be 85% multiplier with those charges yes, except I think Divine's a bit higher due to CO.

I haven't seen anyone post numbers on threaten's success rate, I would guess it's around 25-50%.

 36/57

1/2
2/3
2/2
2/4
2/4
2/3
3/5
4/5
2/3
1/2
0/2
1/3
2/2
2/4
3/3
1/2
1/3
5/5

63% success in test on regular mobs. Don't know if it's like PG and works half as well on bosses but it's certainly possible.

What you mean "like PG and works as half as well on bosses" ?
By PG you mean Power Guard?