Poseidon loved his children dearly so when his toddler son, Polyphemus, was blinded by a man called Odysseus he was outraged and determined to find the man.
One day he felt something odd in the sea and then realised that it was blood however not just any blood, the blood of his teenage kid so he was obviously really worried, exactly the same as he had been with Polyphemus.
Poseidon eventually came up by a few rocks that the blood was pouring from and then he froze. His child laid weak and incredibly injured on the rocks, pale and sick. Next to his kid was a copy of his trident with some kind of poison on the end which had been used against the child and the cause of the state.
Poseidon, being the protective dad that he was, immediately moved to be by his child's side to heal them and comfort them, gently picking up his teenager.
"Hey hey hey, kiddo? What happened? Don't pass out right now! Cmon.."