This is the first MMORPG I've ever played that a boss could drop absolutely nothing. NOTHING!
that usually happens to me when the boss is 5% hp left and then a lag spike occurs.
either its lacks a game code or someone has been using an IF ELSE on the game.
speaking of that..
I conducted 2 BC runs: a level 26 (now going 30 dues to endless BC run) and a level 34 both of them have 100 stacks of passcards, the drops are the same: THEY ARE STILL LOW D:< even you didn't kill or kill Rupi, Gupi and Lupi the drop rates are still the same.. STILL LOW..but for Rapid, killing Rapid is a must it is either enhancement stones or crap drop but still better than those three flying whelps.
but then again I'm using high level characters... gonna try if the drops are better when you are exact level on the Req. Lvl for BC (Level 25)