I will attach a video to go with the title.
NOTE: I did die in this video, but I also had a couple runs before this one where I had successfully made it past that middle blue mage on island 5, but I failed because I was unable to sand down all the towers, and I had used up all of my reverses by that time. I hope this makes sense, as the video does not show me going past the middle blue. I will edit this post when I get a video for a better analysis, and to help you all in helping me see where I messed up.
Edit: For some reason, it won’t let me post the video. I will take a screenshot of the base instead so you all can get a visualization of what I went through as you read the explanation above.
Edit 2/The Picture: