The Boosting.avi file you have requested: Modifications / Earths Special Forces / Videos and Trailers / Earth's Special Forces ' Boosting' Trailer - 10.58mb is not available. Perhaps try browsing all files for the game Half-Life and upload any files you want to share or are missing. This is the only information we could locate:
What you're seeing is the Charged Turbo and Boosting features. Please bear in mind that this is still very WIP, there will be graphical tweaks as well as functionality tweaks in the future. Here's a little clip of some new features we've implemented recently.