Call in. A single player mod which plays out at the same time as Gordon and Alyx flees the citadel in Ep1. You take the role of a rebel soldier on a mission to retrieve information regarding the super portal to aid in the building of Dr. Magnussons rocket.
These screen shots don't justify the lightning. I had to make the picture brighter since the first upload was almost black.
But it gives you an idea.
Cool
Pretty nice!
this one looks like my backyard