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The bit in the video is of a spoon type or flat port. It is also comparable to a catheral = and yes I know most people freak at that bit. However, it communicates a lot of the information your hands are sending to the tounge and roof of the mouth. I like the higher port, but it isn't for a baby horse or a green horse. I also like to ride with a very loose rein.
Your basic snaffle works off pressure on the bars of the mouth - and an O ring verses D ring work differently also. The O ring snaffle has movement if it is not fixed (like most) and a really sensitive horse will feel the littlest movement in that ring before you actually pull on the reins. The D ring is like a full cheek also in that it is fixed and will pull on the side of the mouth along with the mouth piece action. Now I say snaffle in the mouth piece itself has one "joint" inside the mouth. If you have a French Link or a Dr. Bristol, you will get a different pressure point - being the tounge more than the bars of the mouth. Some horses simply cannot stand bar pressure in their mouth and do better with tounge and roof of the mouth pressure.
A flat mouth spoon port like the one in the video also promotes the horses head to stay verticle since they would enact the bit if they lifted their heads. The shorter shank is less corrective than the longer shank. Since the horse in the video could not get his head comfortably above the bit by stretching out his nose, he had a much harder time of running away by grabbing on the bit and keeping that head in the air. And once the bit had more communication - even with an inexperienced rider - he had a better chance of figuring out what the rider wanted. This horse's inexperience really showed in that situation.
Snaffle bits and hacks are wonderful training equipment. And for the right rider they are great. However, for someone who doesn't know how to ride they can also become something to hang on and dull the horse's response. Especially one that doesn't work well with the pressure the particular bit gives them.
I did not look up your combo bit, but some of them simply have a lighter or less corrective mouth and a nose band included.
Each horse is different. And a bit is only as hard on a horse as the riders hands.