Long recording... he is realllly good.. really good... and I am probably really bad at determining hacks... really bad...
but...
1) he seems to notice stuff that is a long way away and not yet visible...
2) he seems to know just where on the roof of the boathouse a particular player is... from red spawn on bridge he does see that someone is up there... but then he takes aim exactly where they pop up...
3) he seems to track along a wall a player who is moving fast when the player finally appears before him...

I am probably wrong and he probably has a huge screen and really good headphones on....

If I am wrong then this video should be an argument for turning on friendly fire because he wears tacs and literally shoots at everyone...

cheers