Bilbo wandered around in the cellars of King Thranduil’s Palace. He found storerooms and wine cellars, apples and potatoes along with barrels of wine and ale. But the cellars went deeper and they were darker, with the sound of rats scratching the floors as they scurried along and other things, bigger things moving about in the darkness.
He looked for a way out. He needed to save his companions. He might be a burglar but he wasn’t a very brave one.
At the end of one such tunnel, he saw a light and the river beyond.
He could save them!