Allegorical stories of saints battling with giants, monsters and demons may be interpreted as symbolizing the Christian's fight against paganism. At Bwlch Rhiwfelen (Denbigh) St Collen fought and killed a cannibal giantess, afterwards washing away the blood-stains in a well later known as Ffynnon Gollen. In Ireland, the tales of saints slaying giant serpents may have the same meaning; alternatively they (or some of them) may refer to early sightings of genuine water monsters. St Barry banished a serpent from a mountain into Lough Lagan (Roscommon), and a holy well sprang up where the saint's knee touched the ground.
Percy glanced over. He saw the fallen giant and seemed to understand what was happening. He yelled something that was lost in the wind, probably: Go!Then he slammed Riptide into the ice at his feet. The entire glacier shuddered. Ghosts fell to their knees. Behind Percy, a wave surged up from the bay-a wall of gray water even taller than the glacier. Water shot from the chasms and crevices in the ice. As the wave hit, the back half of the camp crumbled. The entire edge of the glacier peeled away, cascading into the void-carrying buildings, ghosts, and Percy Jackson over the edge.