As far as why this thread could/should remain open - as has been noted, it's totally within the rules, and it isn't a spite thread in either direction.
Plenty have people have been in favour of Harry, plenty have been in favour of Cap. As I said, Harry's a glass cannon - plenty powerful, but with scrawny-teenage-boy-durability.
If he can tag Cap with a single body bind (whatever the hell it's called), or some other disabling-jinx, he should win. If he can't hit Cap before Cap can close the distance/shield throw half a kilometer, Cap would stomp him.
It just depends on which you think is more likely.
As far as shield charms go, I dunno if Harry'd want to put one of those up. I recall it separating two wizards, and preventing spells from going through. I DON'T recall it preventing a mach-speed shield from going through. Harry'd be disabling himself by not being able to fire a spell through a shield charm dealie.
😬.