[neoRT]

You can't do longjump in cstrike. That's probably a model of the longjump on that map. That doesn't mean that you can use it.
Maybe it will be possible with an 3rd party amxx plugin... but on a default hlds buid it was never possible to make longjump.
The longjump is available in Half-Life, Opposing Force, Adrenaline Gamer mode but not in cs.