On Public Build 2_0_7
If an enemy does 2 animations on the player after being knocked down (ie: knocked down, animation, don't get up, another animation), the enemy sprite won't join the animation properly and will simultaneously be standing there and engaged in the animation.
The J key to self-knockdown works even while knocked down, which is a hilarious mode of traversal but also a way to escape animations with multiple buggy consequences, including having two player sprites visible. (One under control, another locked in animation)
Combining these two bugs it is possible to get knocked down, then escape during the second animation with the self knockdown. Now there are two copies of each the player and the enemy, but the standing enemy sprite will be completely idle, leaving the player free to beat the tar out of them until they disappear without a death animation.