Dream About Witnessing A Murder In A Hotel

I was in a really nice hotel for a convention event. I was down at the pool, meeting up with people I didn't know who were also attending the event, and getting ready to play some sort of card game, when David Tennant, dressed as Crowley from Good Omens, and Catherine Tate joined the group. Unfortunately, I had to leave just then because I had to drive back to my hometown to pick up my best friend who doesn't like driving outside of town. When we got back to the hotel, she hopped in the shower. I was wandering around the (very nice) room waiting for her to finish freshening up so that we could rejoin the pool group. I looked out the balcony after grabbing my personalprotection items -- a sonic buzzer and a pepper spray canister -- off of my backpack where they were hooked on. (The backpack was grey, and the sonic buzzer was a grey camo). There was a security officer for the event with a K-9 companion patrolling the catwalk right by my balcony, keeping an eye on the event. The K-9, and German Shepherd, gently got the officer's attention. I remember thinking he was very cute and sweet with his companion. He was asking if the dog was hungry, since it was the end of their shift. As the officer spoke with the dog as if I wasn't right there, I remember getting a really bad feeling. I looked at him thinking, "he's going to die, isn't he? This is when he's killed" He knelt down to be at eye level with his K-9 companion; he was petting him and cradling his face. I noticed a "thwip" sort of sound first, then the warm mist that hit, the way the officer just kind of froze up before collapsing from an angled gunshot wound to the head -- a sniper round. The K-9 looked around. My first thought was "grab your backpack so it doesn't get stained", but as I reached for the handle I realized it was now part of a crime scene and removing it for any reason would be tampering. Someone from the other end of the catwalk was talking. Asking questions about collateral damage? I hadn't really been listening. I told my friend to stay in the bathroom, do not open the door, as I pulled my cell from my back pocket and dialed 911. A man in a janitorial onesie stepped out from the catwalk with a sniper rifle at his side. I bolted for the elevator while I waited for the phone to connect. The shooter was talking to me now. All I remember was him saying something about speaking to the officer before, but the question ultimately was addressed to me (as i was now his next target, since I'd witnessed the assassination). "911. What's your emergency?" The elevator doors opened and I fell in. I started pressing the 'door close' button repeatedly. "I just witnessed a murder and the sniper is after me now. I need you to send help to the hotel or I'm going to die. I don't know what to do, where to hide...." The sniper stepped around the corner at the other end of the hallway. And then I woke up from a full body shiver.