Just did the Recommended Expedition in Daybreak. Another player joined the MPA, he did his thing and I did mine. Then he spawned an Andajurili halfway to the other side of the map. I headed that way and he and the boss disapear into unexplored territory. I'm killing mobs and dealin with a Unite ET when notice that a Falz Angel had spawned pops up, somewhere in the fog. When I finally find the first boss it is a massive cluster F with the Andajurili, Falz Angel and another Unite ET, right at the exit to Area 2. At this time I also noticed that it was just me left on the map.
Please, if you spawn something big with other players in the MPA, at least don't drag it to the exit and leave it for them to deal with. Try to hold out so others can help take it down rather than spawn more and more as you run away.