[Wow. A little thick, for one of the cleverest wizards in his class, wasn't he?

Well, just went to show. Can't confuse 'diabolical' with 'clever'; or you'll just be disappointed when you meet young versions of historical figures in parellel worlds.]

I've never had a problem with walking, personally. Among muggles or elsewhere. Mid-air is a little tough, but that's what we've got brooms for.

[As much as James would like to crush Gellert's hopes of a charming future where muggles were enslaved by magic folk, he wasn't altogether sure he should be creating paradoxes and... whatnot... with that information.]

I'll put it like this, hey: it's not what you're expecting.

[Thank Merlin for that.]