Possible Clues:

• Counsel might have had it on the rocks with his friend up there
• Transformed sea nymph - namely an upcoming partner
• Counsel is the very opposite of a friend - he might have wrecked you
• Rock shows, namely, all unknown climbers
• In Greek myth, sea monster that lived opposite whirlpool Charybdis
• Mythical rock calls waves to drown unknown number
• In Greek mythology, a monster who drowned sailors in the Straits of Messina
• Charybdis counterpart
• Transformed nymph, namely a climbing partner
• Charybdis's counterpart, in Greek myth