I've always been told that loot priority is whoever gets first hit but there have been a few times where:
1) I didn't get first hit but got MVP and got loot priority
2) I didn't get first hit and did not get MVP and got loot priority
3) Did get first hit and MVP but not loot priority
Now I'm 99% sure First Hit credit / Total Damage credit carries over when switching maps so this could explain (3) but does not explain the other two. Also, credit even goes beyond accounts somehow since in two different occurrences my full support priest got MVP yet I did not do any damage to the MVP but my Knight did which is on a different account and the Knight was logged out at the time of the MVP's death (yes I know this game is so broken). Could someone clarify how loot priority actually works?