Grim Panda/Knockback Cancel

• This is a method that lets you skip the knockback from the Panda King to save yourself about 8 seconds per time that it's performed.
• And this is a more specific explanation of the skip with a visual from Neon:

As is pretty normal with these bossfights, you can hit START and load the game right before you perform the last hit, then hit the view map button and go back to the hideout - you could also just jump and straight up view map and go back to the hideout as you get the final hit.