Please read the rules for Burst in Face to Face rolls - https://infinitythewiki.com/Combat_Module_Intro#Face_to_Face_Roll Both players make one Roll for each point of Burst they assigned to that target. When it talks about a "roll", it's referring to a single die, not the entire pool.
It doesn’t really change much aside from needing clearer clarification, (though I find it clear, others may not hence this thread). Each roll would still be counted as the Face to Face dice are all counted together. As far as I can see from what is written in the rules, the fusilier fires 3 shots, the Zhanshi AROs with 1. The fusilier’s 11 beats the 6 from the Zhanshi, the fusilier’s 6 cancels the 6 from the Zhanshi and the Zhanshi’s 6 cancels the 3 from the fusilier. One armour save would then be required. Edit: (this is how I read it anyways). I’m still trying to find the clarification thread from before but have also emailed the rules team to provide clarification.