PS4 Inquisition: Dragon age - The Final Piece

I went to the Altar of Mythal and fought the Dragon, got it's health to halfway but instead of it cutting to the cutscene, everyone just stood still and nothing was happening. So I left and went back to skyhold, when i tried to travel back to the Altar, it wouldnt let me. Now i cant travel back to finish the story line, even when i restart the game. Any help?