You do not appear to have a safe backstop...were you to shoot only slightly high, your bullets may enter that wooded area behind your makeshift target.
Other video clips you appear to have produced show target vegetables or stones placed on top of your makeshift target. EG http://www.youtube.com/watch?v=GFfMwjVDW04
By way of support, and linked with comments already made by dromia, I would recommend that any further videos you make dispel any notions that you may be unsafe in your shooting endeavours.
