Windows Tomb Raider help

Hi im going to be a proper noob now ok im stuck on the radio tower bit were you have to climb up the zip line to the tower but i cant seam to drop of lol am i being a noob by pressing the wrong button if so whats the right button ? or is my game bugged ?

Any help would cool

 

Press L shift on the keyboard to drop off, I am sure I had a similar problem.lol.

 

Lol thanks should i delet the post so i dont look so silly

 

Now i cant spell lol

 

No, we have all be caught out at some point. Me more than others I suspect.lol