Another Force Orb point to consider:
Let's say we have an orc, surrounded by eight kobolds. We target the orc with Force Orb and hit; all eight kobolds are adjacent to the primary target, and become secondary targets.
Let's say we have a (Large) ogre, surrounded by twelve kobolds. We target the ogre with Force Orb and hit; all twelve kobolds are adjacent to the primary target, and become secondary targets.
Let's say we have a grand banquet table, surrounded by thirty kobolds seated and eating dinner. We target the table (a single object) with Force Orb and hit. All thirty kobolds are adjacent to the target, right?
Now we target the ground...
-Hyp.