Came across this on reddit. Sounds like they have paintball guns that shoot the user when he gets shot - that could be kind of immersive!
![Smile :)](./images/smilies/icon_e_smile.gif)
I do like the fact they have implemented what I had only thought of previously and hadn't actually seen video of. Looks like they have the projector(s) in a dome, on a swivel, so they turn to follow the users head. This means all you need for a 'CAVE' type setup, is just the projectors, a room, and a very fast panning system, as wherever you look, it is putting the projected image. Way better than CAVE setups in some ways (kind of combining with HMD's benefits) as you dont have to render views (for example, behind the user) that the viewer can't see... less projector bulbs to replace as well!