Agreed jymil - the FB video clearly shows that an inappropriate cyclic movement can rapidly change the attitude of the helo - it is a natural pilot reaction if you feel the tail going down to push forward with the cyclic - if you panic and shove it forward while you still have some collective applied then the videos amply demonstrate what happens.
JohnR81 - the rearwards flight demo has been a standard one in the military for many years. The idea is to make pilots aware that the combination of groundspeed and windspeed must be considered when manoeuvring. In particular, the demo should highlight that, when trying to arrest rearward movement, care must be taken with forward cyclic to avoid a rapid nose down pitch and, if it is experienced, the recovery should be led with collective.