I can't read any of it, maybe Gabs can give us an idea of any relavant info.... but this guy is persistant, for sure
He is on a very short strip and I doubt he has had many lessons, if any, so he just does run after run after run with the stick back after prerotating and the poor little 503 trying its best 
It is a very good teaching tool to show students what happens when you have the stick back and full throttle.... it shows quite well just how much drag the rotors can create and how important it is to allow the stick forward , once the rotors are up to speed, to allow the machine to get the airspeed it needs to fly.... most of the time the machine is well behind the power curve, only travelling at walking pace and unable to accelerate..... I found it well worth watching, it sure proves that a longer strip and training are a good idea 
Check out the nosewheel leg
it looks anorecic even compared to a dominator .... seems to work ok 
I actually like the machine.... would need a 582 for my fat ass tho 