Use the rifle that you find at the start of the level to snipe the head of the rider of the VS. It will take about two or three shots, but he returns to the same position for an easy snipe. Disregard all of the other people shooting at you and run to get into the VS. Kill your way to the end of the map, then get out of the VS and go through the door. Once in the next part of the level, run to the VS that's on the ground forward and slightly to the right of you. Destroy the other VS that are trying to destroy you. Note: The Boss VS is the VS jumping around.