Charles decided to think about it as he left the potion and the stables. As he did. Someone else enter the stables.
It was Monica. She is a mage, of the castle, and has a crush on Prince Damon. Monica returns and place her horse in the stables.
She was going to see Damon. When she see's the potion that Charles left. Monica picks up the potion.
"Now what is this?" She starts to examine it and realize what it is. "A body swap potion. Who would want to swap bodys and with who?"
Monica heads back to her room. She starts to work on the potion. "Someone wanted to swap bodys with another person. The potion was drank once. So whoever drinks it next. Then they swap with someone else."
Monica wanted to drink. But she didn't know who drank the potion first. So she didn't who she was going to swap with first.
"Well I guess I can give it a try."