The Creepy Guy

Back at the start of 2017, I was playing ROBLOXian Waterpark. I was in a normal server with normal people, then my friend joined. We went on a few water slides and have some fun in the pool and we were just being funny. Then the WHOLE server lost connection, except for ME. Everyone in my server left the game, about 4 minutes later my friend messaged me and told me she lost connection. She tried to join back but it wouldn't let her. No one could join the server, it was like the server was locked...and I was locked by my self. Then this guy by the user wjsjsjsk joined. I was relieved and I told my friend the server was unlocked and that she could join. She tried again, but it wouldn't work. I told her it must be laggy for her and that she might have to go offline for a while. But without even replying, she just went offline straight away. I felt bad for telling her to go offline but I was hoping it would work for her next time. A few minutes later she came back online and tried to join again, but it wouldn't work. wjsjsjsk was just walking around, so I asked him how he joined. When I said that, he stopped. He stood there for about 2 minutes, then started moving around again. I decided to leave, so I clicked the X at the top right corner of my screen. I clicked it several times and it would not work. I clicked esc then clicked leave game. It worked but it joined me back straight away. Then wjsjsjsk finally said something. He said something like "where. are. you. going. ?. :(." Then stood there for another 2 minutes. I replied with "I have to go..." because I was too afraid. Then I left. Suddenly all my friends went offline. And the only person online was wjsjsjsk... but I had no idea how he got on my friends list.