Move the bat_swarm folder into the LF2 folder.
Add these lines to the data.txt:

id: 87  type: 0  file: bat_swarm\bat.dat
id: 710 type: 1  file: bat_swarm\bat_follow1.dat
id: 711 type: 1  file: bat_swarm\bat_follow2.dat
id: 55 type: 0  file: bat_swarm\bat_form1.dat
id: 56 type: 0  file: bat_swarm\bat_form2.dat


Controls for the bat swarm:

  <^>v - move around, "walking"
  Atk  - the bats fly faster
  Def  - the bats fly lower
  Jump - the bats fly higher

  Def + Jump + Atk  - Transform back, the bats die