Why didn't the henchman get out of the way?

That was the point.

"Oh my god you cannot just name an owl Carl!!"-Pottergoose

Are you for real?

Because it's funny that way.

COOKIES AND MILK!-Ed

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Henchmen aren't that smart; that's why they're henchmen. Remember how blissfully happy Homer Simpson was working for Hank Scorpio, completely unaware of who he really was?

lol well aren't you also wondering why Austin was taking so much time trying to turn that cart around?

Re: Why didn't the henchman get out of the way?

Because when they found an interesting-looking location for some interior pursuit and action scenes, there was this big room with a steamroller in it, and they were thinking of gags they could do in that room, which was really big and had a steamroller.

So, how would they use that big room, and henchmen, and the steamroller for a gag? How man options did they have? "Chase and run someone over in a spacious room" comes to mind right away. But how to make that funny?

The rest is history.
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The story is king.

For comedic purposes.