Anyways, for those who were curious... here's how mine went down.

Paladin's hit roll for spell: Hurt: 13 (+1)
My dodge roll: 12 (+5)
I dodge the attack

My tactical roll: 11 (+5 DEXmod)
I light the torch.

Backstabs' hit roll: 8 (+5)
Paladin's dodge roll: 18 (+1)
She misses...

My hit roll: 4 (+5)
Paladin's dodge roll: 7 (+1)
I hit for...
my damage roll: 5
5 + 5 - 2 = 8 / 2 = 4
The paladin zombie was at -16 as of my post.

Also, it looks like Evanist has finally learned that torch lighting is a dangerous business.