The second pack after Archdruid Glaidalis consisting of two Vileroot Blossoms, one Rotheart Creeper and one Rotheart Dryad is marked as a four mob linked pack. However if you pull the dryad when she jumps away from the pack she can be pulled without the rest of the mobs aggroing.

Group connections in MDT do not reflect if NPCs are linked together in the game world.