Lucid dreaming with Rauwz

I was with about 4 people, and we were playing a Batman game, first person. we needed to kill some guy, who was ridiculously overpower. The "map" was HUGE, and there were inside and outside areas. There were different power-ups and weapons scattered around the map, that you needed to kill the guy. I found out i could float in the air, and that helped me with kicking the guys ass.
We got him in the end