As a student (21 jumps) I can certainly understand that our senses can become overwhelmed. As an AFF level I student, his only real responsibility was to understand his emergency procedures and follow his instructors instructions on landing (the instructors can keep you stable, pull for you if you lose altitude awareness etc) .
I am willing to give him the benefit of the doubt (reluntantly) that during the skydive he was overwhelmed (and not a dumbass), but in listening to his response to the video, he still thinks that his parachute "just flew away"...sorry, but that IS a D... A... Anyway you look at it!!