How does one do a walk cycle like this with the Animation tool?

So in this video

at 0:10 there’s a sequence where the Engineer mimics Scrat in looking for somewhere to place his Dispenser. What I’d like to know is, how did Eltorro64Rus go about animating that walk cycle using the pose-to-pose only Animation tool?

There’s also a very nice motion blur on the Engineer, which I would also like to know how it was done.

Looks to be stop motion, and therefor the blur is more than likely a smart blur applied in post, a plugin(s) for After Effects (though I don’t believe free). If I’m not too outdated, the most efficient way to go about stop motion would be to use Henry’s Animation Tool.