Okay, Here's the thing:

In the videos that the scout is in, he's always running past the sentries so fast that they cannot track him properly, and always just miss him completely...

Is there a button for that skill, because I seem to die the instant my scout enters the range of a sentry gun no matter what speed I'm going, and no matter what angle or direction I'm taking... If I don't get out of the range within the time it takes for it to beep about my presence, then I'm dead; chacka chacka, then down like a sack of potatoes.