Strange player on Warhub minecraft server 1.1

GamerX9: welcome!
GamerX9: today, strange things happened on the server
GamerX9: when I was visiting a community house, which was used by some players (almost zms), I saw the name of another player next to me at my screen, cause zombe's modpack can show it
GamerX9: I just walked around, I didn#t find the other guy, then I found sign items, so he must have been in the house before
seansan1: oh
GamerX9: after some time, I saw him flying around in front of the door
GamerX9: then I was afk for some minutes
GamerX9: when I was back, he was inside the house
GamerX9: I saw him by looking through the floor with the modpack in one of the lowest rooms, that can only be accesed through other room
GamerX9: I didn't walk into the rooms of other players, he did it
GamerX9: I forgot to say, that the entrance room, that was directly under the bather was flooded
GamerX9: the blocks under some water in the bath have been broken and the water flood into the room below
seansan1: so
seansan1: he griefed?
GamerX9: I tried to find out who it did, but logblock didn#t work anymore, I jsut saw who built the block, not who destroyed it
seansan1: did u see the players name?
GamerX9: the strange guy was down insdie a private party room and played around with not blocks
GamerX9: I floowed him
GamerX9: when he noticed me, h flew
GamerX9: I kelp stalking him
GamerX9: but he always returned to the house
seansan1: wow
seansan1: DAM IT WHEN CAN WE GO BAC KTO TOMMYS
seansan1: i WANT TO CATCH THAT GUY!
GamerX9: one time, he destroyed glass to get outside after he had noticed me and I wasn't able to seee that with lb
GamerX9: the server started lagging mroe and more
GamerX9: then he was into the room of knight steel, which had an unprotected doo
GamerX9: I tried to call the owners of the house but no took care of me
GamerX9: then I called knight steel
GamerX9: he came and skywalkerjake came too
GamerX9: I stood in front of the door, so the strange guy wasn't able to get out
GamerX9: he called me a monster, the first time he wrote into chat
GamerX9: when the others came, he went through another door into the room of Unicron, but the door was locked
seansan1: wow
GamerX9: The he destroyed blocks to get out
seansan1: he is a good griefer
seansan1: Wait
seansan1: STOP RIGHT THERE
seansan1: ok
GamerX9: it was so laggy, I wanted to relog
GamerX9: I logged out, but when I tried to log in, the connection timed out
seansan1: 1. Whenever he destroys a block u cant lb it
seansan1: 2. He has zombe
GamerX9: wait
GamerX9: skywalkerjake and me talked about him in a Hamachi chat
GamerX9: it looks like he crashed the server
seansan1: wait
seansan1: do u know the name
GamerX9: I think he used a program to send loads of data to the server, so it overloads