A Lonely Knight is a Lost Page from Pontius’s mini story in Trine 3: The Artifacts of Power.
“Darn them people who leave holes lying in the ground like that!” Pontius told himself.
“Anyone might fall down them!”
He had taken a bad fall in the middle of their quest.
“Still no closer to finding my way up to Amadeus and Zoya.”
Pontius: This looks like an abandoned mine. Which means, it must have an abandoned entrance!