When I was questing in BEM on the mobs that drop the pattern my main saw the drop on a corpse and was not the enchanter. It was set to FFA loot. I can see someone missing a bop profession drop if they are quickly autolooting. It shows up red when you loot and once the window closes you cant bring up the loot window again unless you have something lootable on it. Only the enchanter will be able to see it.