I have not been able to view the video, but the problem with the BO-105 is due to the collective-to-cyclic coupling inherent in a rigid rotor system with such a high degree of effective offset. This was demonstrated to me while flying the BO-105 at WTD-61 in Manching, DE. We entered a high powered, high angle of bank turn to the right and attempted to roll left out of it. Full left cyclic, aircraft continued to roll right. The recovery consisted of a split-S with a symmetrical pull-out. All of this was planned and we ended up recovering at 1000' AGL from an entry altitude of 1500' AGL. The PIC stated to me that the German Army had lost several BO-105s due to high AOB maneuvering while NOE. Very maneuverable aircraft and quite confidence inspiring in any attitude, but in my short exposure, there are definitely some handling characteristics that demand respect.