I had a lucid dream without even meaning to

Date: 2/23/2019

I was standing on a huge grassy hill with big rocks sticking out of the ground and then I realized that I was dreaming. I took advantage of the opportunity to do whatever I wanted so I attempted to turn into my favourite animal (which is an otter) by saying "I am an otter.... I am an otter...." But it didn't work and these two people who looked like they were from medieval times came carrying a huge spiky ball and chain and took me away and locked me in this dark and creepy dungeon underneath a castle