Resynced up to 5-2 final screen with Scumtron's 14 frames faster + 2 frames for better ending and good sub Xs.
Knife bitch was a little bit better with only 14 frames (and 1 blank frame, so 13 total) (GIF here again: http://imgur.com/B6nDpWd ), but with the additional 2 frames:
- Going without delay: second knife hits us while jumping over him
- 1 empty frame: first knife hits us while climbing the platform
- 2 empty frame: second knife hits us while jumping over him
Putting 1 empty frame before spawning knife bitch is used to manipulate him to walk to the right side so we have space to land next to him.
Knife bitch timer in this movie is 24, 17 frames of waiting and 46.
With scum's + blank frame: 26, 16 frames of waiting and 48.
edit: since we sacrifice 1HP at 5-1 start, we have 3 HP to spend in this level, which used to do the birdy boost. Other alterative use of 3 HP is boost from 5-2 3rd screen ballerinas (2dmg) and 5-2 last screen boost from the knife bitch's knife (1dmg) and avoid birds to finish.