Depends on the technology that paul takes through (hell, given that there is no size given for the doorway he could take a tank through, ill assume that he doesn't), if he takes a laser/(any type of ranged weapon)+shield he would win for sure, since none of ezio's ranged attacks would work vs the sheild, and paul could just shoot him with a gun.
CJ1145, you mistaking how the shield works, paul can just use a sword/gun, and attack as fast as he wants, while any of ezio's attacks would have to move slowly to get through the shield, likewise, stuff can move through the sheild slowly, so he can breath through it, now if there was a hurricane, i doubt that he would be able to breath through the sheild, but assuming that the wind ISN'T moving crazy fast, he would be fine.
Barbarossa, im pretty sure that the punching hand would be repelled, but nothing whatsoever would happen to the reaching hand.
There is more info on the dune wiki on how the sheild works:
http://dune.wikia.com/wiki/Shield/XD,
Personally i think the fight might go something like this (assuming paul took a sheild+sword and no gun):
Ezio:*throws knife*
Paul:*sheild deflects knife*
Ezio:*shoots him*
Paul:*sheild deflects shot*
Ezio:*gets within fighting range, and stabs at his seemingly unprotected chest*
Paul:*sheild deflects, and he uses distraction and ezio being off balance by his attack missing to stab him somewhere*
i think the last part would occur like 5 times, and eventually ezio would just die of blood loss/a fatal attack.i doubt ezio would even figure out how to get past the shield. if i tried to punch somebody and they just shrugged the attack off, I would hit them harder/faster next time, not slower and i get the feeling that ezio would do the same thing and in the end not even hurt Paul.
Therefore, the only way that ezio could win would be if for some reason paul left *all* future technology at home, and just brought a sword, even then though, Paul is pretty badass.
Also, the voice would be pretty useless in a fight to the death, i haven't read dune for a while, but im pretty sure that it isn't strong enough to be able to order someone to put down there weapons and die.
In short, all paul needs to do to win is take a gun through and gg