The final piece of the Third Key, the Twilight Crystal - proved to be both a curse and a blessing for Adam.
It was a rare opportunity that could only be obtained if certain conditions were met. Adam didn't know where his battles against the Hollow Wave monsters would take him, but he was in his place in large part because of it.
Despite what was going on above, Adam and Lexa had successfully made it to the Twilight Crystal, they had reached their destination, and it seemed that now Adam only had to wait a little while before he could return home.
Once the Third Key absorbed all of the Twilight Crystal's energy, Adam would be able to escape from the Dark Shore. It was the only way for him to return to a place where his power meant something.
Normally, this would take a few minutes since everything else was ready. He and his Evolution Tree were waiting to move on to the next stage.
But... the Befallen Crown knew this as well.
