Hahahaha! Where's MIE??? This is pretty cute. My horse would literally tell me to go jump the water my own darn self.... HEAD FIRST!! I suppose I would only say... and this is just my own opinion from the feeling I get from the vid.... as I don't ride X-Country... so I have no ACTUAL training on such things... I would simply say that you both don't look like you have a whole lot of conviction about that question. Like, you're not sure... and neither is your pony.
The one thing I wanted to point out, is make sure you are not leaning back before your horse jumps down the bank. The current 'down bank' technique being taught is to treat the take off for the bank just like a jump, and only start leaning back when the horse straightens out their front legs to land. It is not as important on a bank this size, but you want to get used to it for when they start getting bigger !! Nice job =]
Hmmmm - your saddle properly fits you? I ask because you appear to be "floppy" and unbalanced in your tack at times. I do notice that your seat gets put quite far back in your saddle, and your legs get ahead of you.
I suggest you work a lot on 2 point - getting those legs solid and under you, getting the weight in your heels. Learn to balance over your feet and solidify yourself so you will be more "solid" more "secure" and not so "floppy".
I'd like to see you grabbing some mane or using a crest release so you don't hit your horse in the mouth when you get bounced around. You don't want to accidentally punish him for doing the right thing.