Alright so... Eh.... 
First roll for initiative: 18. So I have first strike.
Attacking the fighther, my roll: 20!
Fighter's roll (Though he failed): 4.

So critical damage! 
Total damage to fighter: 2* weapon damage + stat mods. This means 6*2 + 6 damage (from half dex) + 2 damage= 20 damage!
Welp... that guy is down...

Second hit, towards white mage.

My roll: 3

White mage: 15

Its a miss