Pretty weak tbh.
Since theres no facial expressions, and everyone does injuries in their animations, i wouldnt be afraid to exaggerate it.
Jackie Chan in pain:
In the video the half-second the pain hits, he reacts fast, then slow for the after pain.
Make the stick jolt with pain and then slow movements for when he is dealing with the aftereffects of the initial hit.
If the stickman made a sound when he got hit, you got him to say something on the lines of "owwwww". But if you really want it to sell as pain, get it to "OOH F*CKING SH*T OFUUUUUU"