There's a mechanic that will make total sense in retrospect, but which I also struggled to spot until I found it accidentally on level 8!
So I think I know the mechanic in question, since I did solve level 8, and that was my thought as well but I couldn't figure out how to apply it to level 7. Specifically, I couldn't find a way that taking a "turn" could hit the trapped bed on the left side. But with that hint, I'll try and take another look!