Understanding the Fainting Animation

[Rsndh]

One of the things that bugs me right now is that when I defeat an enemy pokemon, they fall off the screen. I see that the fainting animation was updated in version 13 so that it shows the sprite sinking into the base (and I've seen this in Pokemon Reborn and Rejuvenation), but it doesn't seem to be working correctly for me. I think this is the relevant part from PokeBattle_Scene

   def pbFainted(pkmn)
    frames=pbCryFrameLength(pkmn.pokemon)
    pbPlayCry(pkmn.pokemon)
    frames.times do
      pbGraphicsUpdate
      pbInputUpdate
      pbFrameUpdate(nil) 
    end
    @sprites["shadow#{pkmn.index}"].visible=false
    pkmnsprite=@sprites["pokemon#{pkmn.index}"]
    ycoord=0
    if @battle.doublebattle
      ycoord=PokeBattle_SceneConstants::PLAYERBATTLERD1_Y if pkmn.index==0
      ycoord=PokeBattle_SceneConstants::FOEBATTLERD1_Y if pkmn.index==1
      ycoord=PokeBattle_SceneConstants::PLAYERBATTLERD2_Y if pkmn.index==2
      ycoord=PokeBattle_SceneConstants::FOEBATTLERD2_Y if pkmn.index==3
    else
      if @battle.pbIsOpposing?(pkmn.index)
        ycoord=PokeBattle_SceneConstants::FOEBATTLER_Y
      else
        ycoord=PokeBattle_SceneConstants::PLAYERBATTLER_Y
      end
    end
    ycoord+=Graphics.height
    pbSEPlay("faint")
    loop do
      pkmnsprite.y+=22
      if pkmnsprite.y-pkmnsprite.oy+pkmnsprite.src_rect.height>=ycoord
        pkmnsprite.src_rect.height=ycoord-pkmnsprite.y+pkmnsprite.oy
      end
      pbGraphicsUpdate
      pbInputUpdate
      pbFrameUpdate(nil) 
      break if pkmnsprite.y>=ycoord
    end
    8.times do
      @sprites["battlebox#{pkmn.index}"].opacity-=32
      pbGraphicsUpdate
      pbInputUpdate
    end
    @sprites["battlebox#{pkmn.index}"].visible=false
    pkmn.pbResetForm
  end

and if I'm understanding it correctly, this section

  loop do
      pkmnsprite.y+=22
      if pkmnsprite.y-pkmnsprite.oy+pkmnsprite.src_rect.height>=ycoord
        pkmnsprite.src_rect.height=ycoord-pkmnsprite.y+pkmnsprite.oy
      end
      pbGraphicsUpdate
      pbInputUpdate
      pbFrameUpdate(nil) 
      break if pkmnsprite.y>=ycoord

is responsible for the actual fainting animation. I think it shifts the battler's sprite's y coordinate by +22 (which apparently means down) and then checks to see if the new y coordinate would be greater than ycoord (the original y-coordinate of the bottom of the sprite). Supposedly it then "crops" the sprite (the pkmnsprite.src_rect.height part) so that the sprite appears to sink in the ground. Right now however, the sprite simply drops rapidly off the screen without being cropped, and I'm not sure why that is. Can someone tell me if my understanding of the fainting animation is correct and what I can do to try to fix it?

EDIT: Also, for whatever reason the stopping point of the animation (ycoord?) is really high. Changing
ycoord+=Graphics.height
to
ycoord+=Graphics.height-300
causes the opposing battler sprite to stop barely above the "Fight" button, while any values lower than 300 that will simply have the sprite fall off the screen completely.