The Jager Link

So it was a regular day on Roblox, I was playing Jail Break. Everything was going normal tell the game lost connection, so I thought nothing much about it so I restarted my game and joined a random server in Jail Break. When i joined the game no one was inside the game except a player without a name. He looked like the owner of Roblox but his skin tone was Black. I tried to talk to him in game but no response, then I tired to look for him inside the game and I found him in a jail cell. I was a cop and he had no role in the game. So I tried to arrest, and shoot him but nothing. So i though it was a glitch so i restarted Jail Break and log back into the game, when i joined i was in the same game as that dark figure. When I went back to the jail cell and tired to arrest the figure again then he or she started to chase me and saying "542961624" i didn't know what it met but when he or she said that my screen completely red for 1 minute. I thought i was getting hacked so i turned my computer off and didn't get back on to roblox for 3 days. I wrote the number down in my clip board and tried to fined the meaning to it, but when I looked it up i gave me a lot of weird results that were numbers and letters. I kept searching to fine what it met but still nothing. I went back on roblox to my profile a saw a user number in the search bar. That gave me an idea, so When i put https://www.roblox.com/users/542961624/profile in to the search bar, it brought me to a user in the game called JagerLink. I looked more into his profile he had no badges and no items, he had a place but i couldn't get into it. I kept trying to get in but couldn't so i gave up trying to fine him. Thank you for reading.