When you go through a hole in Zelda on mercay island you shoot an eye with an arrow where do you shine the beam

No, not the door what you do is shine the beam parallel with the temple of the ocean king and mercay tavern mercay tavern is the old 2 people place (with two people) where the old guy says after you get the phantom sword "ahh ive beenhere far too long... I'll bet my wife is steaming mad by now now i REALLY dont want to go home!" Sadly i dont know what to do next