What does my dream mean?

I had a dream that I was going to some special occasion at this skyscraper but the building was in partial lockdown because somebody wanted to do something bad. When I first got to the building there were reporters and they told me not to go up there because I might die. I went anyways and someone else got in the elevator with me as we were riding up he pulls out a gun and shoots me 3 times because I was a witness but not the main target. I am still alive but just barley but after a few moments passed by I pulled out my gun and shot the guy in the head twice killing him after i waited fir a few minutes waiting fir help in the elevator but i woke up