It's a bit of an usual shot.
I presume that what is on the screen is really the main attention-getter so maybe... maybe the animation of the characters isn't all that critical. Maybe they are like extras in a crowd, they just need to create a little motion without doing anything that presents key information.
the guy on the right seems unnaturally stiff. His shoulder, arm and hand all pretty much stop and start at the same time.
If a left hand is moving out to the left, usually the motion will start from the shoulder and the hand/arm will lag behind then catch up and arrive later.
The opposite, where the hand is moving back in is harder to make a rule about, but leading with the shoulder is what I will try first.