It just seemed to me like every AFL game I watched people were getting triples right and left. It might also be because a lot of top prospects are in the AFL because of their bats, not their gloves, but that wouldn't explain Norris getting his first triple since '07 so I imagine the field has a lot to do with it as well.
Norris is a solid baserunner. SB numbers and percentage are pretty good for a catcher with a "squatty" build.