He looks willing enough to stretch down into the bit (although the way the rider is riding there is really only so much stretching he can do) He also seems to be searching for the correct answer and that's always a plus when training to do something new. Much better than fighting it the whole way.
Even though he needs a lot more impulsion and seems to be dragging, I do like the action he has through his hocks and hind- I feel like if you ask him for the right thing he could surprise you with how much he can give.
Hope he gets well soon!
We are not human beings having a spiritual experience. We are spiritual beings having a human experience. -Pierre Teilhard de Chardin