Snapping turtles are like alligators...they LOOK slow and ponderous, but if provoked, they can rise up and dash incredibly fast over short distances.
When I was around 16, we had a BIG one (I mean about a foot long) in our front yard. It was like watching a komodo dragon dart around. I took him over to the local general store - they sold turtles out of an old bathtub, for folks to make turtle stew out of
That was interesting...