Without worrying about Lunar Arrows, Poseidon didn't have to fear Ryan, so he charged toward him like a madman. Ryan punched his foe while he was bombarding him with arrows, but he still could feel the effects of Vital Hunter. His punch broke when he hit Poseidon, but Vampirism healed since Ryan caused quite a lot of damage as well.
While pushing Ryan's body backward, Poseidon made his back hit and destroyed several of the ice walls of the castle. The damage was slowly pilling up, and it looked like Poseidon wanted to finish things before Ryan could have any other chance by relying on the debuffs that his attacks were causing.