Coron finished his work and went back to the Alchemy Hall to entertain himself again, and Hill really started to see this ancestor in a new light.
When Hill was erecting the memorial monument, he must have heard the discussions of the Undead Tribe and knew what Hill wanted to do, but he could have chosen not to intervene.
Not to mention that Elven graveyards are in the forest and each is planted with a tree, over the years becoming one with the trees, it was impossible for them to appear among these Undead.
Coron did this just to give Hill a hand.
The Paladins of Tyr also led their horses out of the graveyard, they walked a long distance before mounting their horses again, with determined expressions they looped back to the Temple, presumably to prepare their gear, ready to join their Main God's call to arms.
