Poor little mite looks a tad wrong dont it. I can see rather a lot less flexion right hind, but I did think left hind to start with. It seems to me that right hind drags at some points.
It is definitely dragging the toe of the left hind (the one near the wall anyway)
At first I thought it had something to do with its pelvis but there is something awfully wrong with that back leg
Also I don't mean to be rude but the rider is too heavy or at least rides too heavy. She is banging down into the saddle and the horse looks like it is reacting to that quite badly.
Well I have to say it doesn't look too lame... Just has a sack of potatoes on it's back who is not sitting straight, is very unbalanced and tilting the heaviest part of their body to the inside. I very much doubt a lame horse would stand-off at a jump like that.
She coughed, which would worry me a little bit, and the person filming reminds me of something out of a horror movie, heavy breathing and all
I would say NO. Looks a little unbalanced and not fully accepting contact (my horse does that head bob thing when he is being resistant). Otherwise I would say she looks like a lovely horse.
to me it looks like the rider is holding it too tight in the mouth, causing the head problem and not allowing it to use its back end properly, hence it striding up short. Its also very unbalanced. Dont actually think its lame.