No problem!
When I first fought him it worked fine, his head unscrewed after some hits (as for phase 2 I mean when his head unscrews), then it killed me as soon as it started spinning around (skill issue on my part lol). When I got to fight him again, his head appeared like it was unscrewing, but then after some hits it would reset and the cycle would repeat. Additional context: I was still playing the browser build.
Hope this can be useful information!