For

def update_phase2_escape
    enemies_agi = 0
    enemies_number = 0
    for enemy in $game_troop.enemies
      if enemy.exist?
        enemies_agi += enemy.agi
        enemies_number += 1
      end
    end
    if enemies_number > 0
      enemies_agi /= enemies_number
    end
    actors_agi = 0
    actors_number = 0
    for actor in $game_party.actors
      if actor.exist?
        actors_agi += actor.agi
        actors_number += 1
      end
    end
    if actors_number > 0
      actors_agi /= actors_number
    end
    success = rand(100) < 50 * actors_agi / enemies_agi
    if success
      $game_system.se_play($data_system.escape_se)
      $game_system.bgm_play($game_temp.map_bgm)
      battle_end(1)
    else
      $game_party.clear_actions
      start_phase4
    end
  end