What I find interesting about this particular scene, compared to the play, is that the play's version is much lighter than the film. Fiyero seems less unstable in the stage musical, but in the film where Jon said it’s a bit darker than the stage play, and you can see Fiyero looking crazed and so out of it that love makes you do stupid things. And making sure nothing happens to Elphaba because he’s always been crazy about her ever since she left shiz and the cherry on top, the ALAYM scene. He sees Elphaba as his love, and him threatening Glinda and the guards to back off made me convinced how complex a character fiyero is just as Elphaba.

“𝘐𝘵'𝘴 𝘵𝘰𝘰 𝘩𝘢𝘳𝘥. 𝘐 𝘤𝘰𝘶𝘭𝘥 𝘯𝘦𝘷𝘦𝘳 𝘸𝘢𝘵𝘤𝘩 𝘰𝘶𝘳 𝘧𝘪𝘭𝘮𝘴 𝘢𝘨𝘢𝘪𝘯. 𝘛𝘩𝘢𝘵 𝘸𝘰𝘶𝘭𝘥 𝘣𝘦 𝘪𝘮𝘱𝘰𝘴𝘴𝘪𝘣𝘭𝘦. 𝘛𝘰 𝘩𝘦𝘢𝘳 𝘙𝘰𝘮𝘺 𝘴𝘢𝘺 '𝘐 𝘭𝘰𝘷𝘦 𝘺𝘰𝘶', 𝘸𝘩𝘦𝘯 𝘴𝘩𝘦 𝘪𝘴 𝘯𝘰 𝘭𝘰𝘯𝘨𝘦𝘳 𝘩𝘦𝘳𝘦, 𝘐 𝘫𝘶𝘴𝘵 𝘤𝘢𝘯'𝘵 𝘣𝘦𝘢𝘳 𝘪𝘵. 𝘚𝘩𝘦 𝘪𝘴 𝘵𝘩𝘦 𝘭𝘰𝘷𝘦 𝘰𝘧 𝘮𝘺 𝘭𝘪𝘧𝘦.”

WARNING!!  Potential spoilers ahead for those who haven’t seen it …