Also not to steal your video's thunder but this video also helps breaking down doing stand up slides. Definitely helped me out before your Slide skill tree ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-TO7qMj5N_VU.html
im from street skating and shift to downhill... and believe me i learn a lot from this guy... even my first push up slide... its been 3 months.. thanks