Here's the final drawing!
Since it was an action scene, I decided to animated it a bit as well.
Here's a gif of the process.
And the process explained:
It started with the basic sketch.
Then I cleaned up the lines.
I decided the action lines were a bit too distracting, so I took them out.
I added the basic colors.
Then I created a background to indicate the impact.
I rendered in the shadows.
Then I added some color to the lines.
I blurred out the background to make it feel like it was in motion more. I also added some blur on the characters.
I adjusted the blurs so that their faces and hands were in focus.
I added in the action lines, but this time I made them white, blurred, and transparent, so that they don't take away from the illustration. I also moved Gair's position back a bit.
And for the final, I overlayed some darks and lights!