Logically speaking, ordinary Goffins would not know about the tribe's plan to attack Elven God Mountain as it was a secret.
But Ryder wasn't an ordinary Goffin.
He was a commander and had a high status in the Guffen tribe.
It was also because of this that he was qualified to know some secrets.
Elman was in luck. He captured a commander as soon as he attacked. Coupled with Huanhuan's interrogation, they managed to get a lot of information from Ryder.
When Ryder had told them everything he knew, Huanhuan got a dagger from Elman and stabbed Ryder. She wanted to completely end this unlucky guy's life and let him die.
The gnomes dragged Ryder's body to the door of the house, where the dwarfs were collecting the corpses of the Goffins.
They collectively transported the corpses of the Goffins to the entrance of the valley and hung them on trees for the scavengers to bite.
This was both revenge and provocation.
