Arm breaker: Your newest animation is quite uneased and is lacking physics, but has potential.
Black Stickman: I feel as though you've put to much Emphasis on it's legs. the movement is quite strong and lacks easing, try slowing the movement of the legs by increasing the amount of frames in the animation. You've moved the frames in the back so the upper body isn't stiff, but it could do with some more easing. The arms move quickly and shake a lot. As the stickmans manages to catach the other stickmans arm, it brings his/her arms up and brings them down straight away. Although to dislocate a arm, it would take some force to do so. You could add a couple of more frames between the grab and the lift up to increase easing, then bring down the arm within 1-3 frames. The animation will become more eased and will still contain a sense of power.
Green Stickman: The stickmans first reaction is to punch the opponent, to gain more power you should increase the movement and the spacing in the begining. If you wanted to, you could have the stickman run in to punch the opponent, this will show that the green stickman has gained more punch in his/her punch. the legs just need a bit more easing, the placement was pretty nice. I've already discussed the arms but,i think the arm (Which didn't get ripped off, lol) show more use by again, adding more easing to it. After the dislocation, the other arm which is used for support becomes very stiff and sticks into the back. Just move it a bit more to make it look better. His head can be fixed if you change the movement of it's back as the head will follow, just try and ease the head more by following the onion skin. (the grey outline from the past frame.) ;)
Sorry if you have to read this assignment. Lmao. But yeah. I like it. ;)
Courtesy? *I deserve it for this comment* xD
*Edit* sorry if i get my words muddled up. I'm tired as hell*