They all know these forests and so placing the sounds is not hard.

There is a clearing a little to the West and there is no doubt that the sounds originate from there. The sounds of far too many orcs. Elrond reins in his horse and looks back at Glorfindel.
"Two groups or three?"

There are at least three paths to the clearing, the biggest being the one they are already on. The others are narrower. Slower.