A change of gaits is a change in the sequence of the legs.

There should be no dumping onto the forehand at any moment, in any downward transition.

We need to understand how the horse needs to be balanced in all gaits and through all transitions from gait to gait. 
Which means we shouldn't see a change in the level of balance the horse is working in.

This is the first time we've seen this horse do so well in a downward transtion to walk.  That is huge!