combining weak feats

[Curmudgeon]

I believe the line you were looking for is "YOU SHALL not pass", as opposed to "thou shalt."

Yeah, since King Arthur & co. had to be speaking really Old (5th Century) English, which is a Germanic language vastly different from the one we're using, it makes no sense to throw in 17th Century English word forms.

Those Monty Python guys were mostly Oxbridge types, and they stayed pretty true to the legends. (Except funnier, of course.)