Any of our more experienced HEMA practitioners feel up to critiquing my form?
@Blindside ,
@lklawson ?
OK, since you asked. I only watched a little of the Longsword because I'm not a longsword type guy, my experience with these weapons, past several seminar classes, is actually more in 19th C. sporting Quarterstaff systems. What I saw there looked good. German, style, not Italian, right? Your circling and off-lining footwork looked pretty good but you neglected opportunities for the thrust. I don't blame you, actually.
With the Sidesword, again, my experience is in military saber, cutlass, and singlestick, but it's closer to Sidesword than sporting Quarterstaff is to Longsword.

I loved the fact that you used your sword to cover and close distance to bring your off-hand to capture your opponents weapon. It's greatly a neglected in HEMA. FMA influence? But it worked so well for you that you focused on it when you could have brought other tools into play. Surprisingly, your footwork wasn't as good for the sidesword assaulting as in the longsword. Not sure why, possibly because it's closer and more compressed in both time and distance. But you should use more circling, side-stepping, and x-stepping in your sidesword, kinda like what you did for Longsword. You didn't thrust as much as you should. Your opponent had better thrusting and it took you by surprise a couple of times. A x-step or side-step with an inverted parry would have kept you safe, but that's easier said than done. I don't know if you're studying an integrated system from longsword and sidesword (Meyer maybe? Edit: I see that, yes, it is Meyer) but I think you have room to use exactly the same footwork in sidesword that you used in longsword and I think that would have surprised the heck out of your training partner; circle-step with a cutting attack to threaten and force a guard, then thrust under/over the guard. Sure, it's dual tempo attack but it works really well and I don't think your training partner would have been prepared for it. He also used very linear footwork. Is he an ex-sport fencer or an ex-karateka/TKD stylist? He just has kinda that "feel" to his movements. Offline footwork, force a ward, and thrust past it.
Not saying I'd do any better, just what I think I saw.
Peace favor your sword,
Kirk