Kangaroo's are such buggers!! We've got a cute little family of them where my horse is now. A dad, mum and baby roo that love to watch people ride haha
Half pass is an advanced lateral movement. So yes, horse goes forwards and sideways at the same time, but is bent and flexed IN the direction of travel - this puts a lot of weight and pressure on the inside hind, hence being a more advanced movement - you're old Jo-blow pony clubber won't have the muscle, reaction to aids, and degree of collection to achieve a correct half pass.
Certainly shows that there are a lot of cross discpline exercises that can be used!!
I don't feel the need to be a prissy Dressage rider at all times haha, if I don't think my horse is in front of the leg enough, I have no qualms in getting up off his back and hooning around the arena until he thinks that he's going fast off my leg of his own accord.
Same deal if I've got one that likes to run itself onto the forehand and take off in canter - Go down the long side and if it wants to take off, it gets turned sraight into the rail, and cantered back the other way. Rinse, lather, repeat until horsie decides it is much easier to stay balanced on its haunches ready for these cowboy turns its crazy rider is asking it to do!