Not A Bug Not a bug? Should be a bug...

[Omalley]

I had a character in party with 2 others, fighting the summer boss.. this character was casting blade spirits on the boss the whole time it was up.. and didnt even get credit enough to complete the quest

 

[Dan]

There is a certain threshold in damage each individual player must do to a boss to get credit for a quest. This is in place to prevent people just partying Alternates. The character simply did not meet the threshold compared to the others. It is like this on UO too.