Y'know, while I was watching that, my first reaction was something like

but then I Googled "q3 geoball" and figured things out.
For anyone who wants to be less confused:
http://mods.moddb.com/8920/q3-geoball/
God help me, I'm thinking about making a map for this...I like puzzley-stuff. I'll have to try it and see how it plays first, but it's a cool idea...anyone play Marble Madness back in the stone age?