"Lucas, if you're trying to mess with me-"
"No, I'm not! I knew it immediately that you'd easily recognize me. After all, I'm only a spirit with no physical body unlike Edward. A week ago, he was hospitalized and died. Before the doctors could pronounce his time of death, I have decided to take over his body."
The doctors believed that it was a miracle. However, it wasn't.
So that's what happened.
"It's too bad that this mortal's body is so weak, Master Edric. I could not help you should there be any difficult missions."
"I don't need your assistance as of now. So go back where you came from."
"Master Edric, you're unfair! How come Edward is allowed to stay beside you while I can't?" Lucas whined like a child.
He was sick of living away from his Master. How come his brother was able do such thing while he couldn't.
"Because he can control himself while you couldn't."
"Master! That happened a long time ago!"