Spikes of the Manticore (Ranger Attack 7)

[Hypersmurf]

compare it to Split the Tree, for example, which requires two targets.

Well, yes, but you can use Split the Tree when facing a single opponent.

You select an apparently empty square as the second target, just in case there's one of those pesky Invisible Paladins lurking in it with Total Concealment.

-Hyp.