Advice needed.

So 5 minutes before shift change i noticed my cpl. Standing at the end of the hall and walk away didn't hear any radio traffic or anything, as I come back there is a guy in my day room looked pretty upset and I figured something was up. I turned off the phones and went to go see if the cpl was standing around the corner, as I turned the corner to check I now hear the guy screaming and yelling I go back to try and chill him out and see what's wrong, cpl then comes back because he hears the guy yelling tells him to cuff up and dude didn't want to and stoped yelling and cpl leaves the area. Now shift change is there and the guy starts yelling again I hadn't been relieved just yet still hade everything in my possession.(Keys, phone, etc..) Lt walks by pissed off and says y'all just going to let him keep doing that and a few other remarks, in my head I'm going is my cpl still here? Should my relief call his Sgt? ( His shift has Sgt's in control of that area on that shift.) I felt like I hade no fuckin idea what to do at that moment. I looked at my watch it was now 5 minutes past shift change,I looked up and said I have been nothing but respectful to you but SHUTUP! and walked out to the main hall area to try and proceed with getting relieved? Did I do wrong, what could I have done better? Btw I'm still new only like a month in. I hade no fuckin clue.