Alright, I forgot where I got this info from...but I remember someone telling me that loots won't drop when too many monsters die in one spot.
My knight have been brandishing his spear on huge myst case mob and most of the time they don't drop any items when they die in the same spot.
However, sometimes myst case don't even drop item when they die normally. >_>
Bust this myth for me please. =)