She then found him, or what remains of him. She didn't know what happened, but she assumed that something went wrong for the demon. The soot mark beneath the skull indicated that, as well as the fractured remain of it.
She continued to stared at it, remembering the times that she and Fred actually enjoyed each other's company, when Fred would comfort her when she was shunned by the other unicorns, and how the demon made jokes which she laughed at, and when Oleander talked to him when no one else would. She then remembered how he turned on her.
Oleander wouldn't listen to her newer friends that she somehow made along their quest. She trusted the only 'friend' she had for years, and he broke her horn for that.