a monster in sudden attack

My sister was playing suddenattack. In sudden attack my sister told me strange story. She was playing sudden attack but in the map she saw this monster. This monster destoryed all the blue team and redteam. I didn't die with trg 21 or m4al carvin ak47. We heat a monster 20times with laple and trg lots of time and also we plant a bomb. A bomb is bomped but the monster didn't die. We lost. That was really cool. I wish i know that bug