Program: 164231
Project: 164231
Buggy source:
public boolean attack(Char enemy){
  boolean visibleFight=Dungeon.visible[pos] || Dungeon.visible[enemy.pos];
  if (hit(this,enemy,false)) {
    if (visibleFight) {
      GLog.i(TXT_HIT,name,enemy.name);
    }
    int dr=this instanceof Hero && ((Hero)this).rangedWeapon != null && ((Hero)this).subClass == HeroSubClass.SNIPER ? 0 : Random.IntRange(0,enemy.dr());
    int dmg=damageRoll();
    int effectiveDamage=Math.max(dmg - dr,0);
    effectiveDamage=attackProc(enemy,effectiveDamage);
    effectiveDamage=enemy.defenseProc(this,effectiveDamage);
    if (visibleFight) {
      Sample.INSTANCE.play(Assets.SND_HIT,1,1,Random.Float(0.8f,1.25f));
    }
    if (!enemy.isAlive()) {
      return true;
    }
    float shake=0f;
    if (enemy == Dungeon.hero)     shake=effectiveDamage / (enemy.HT / 4);
    if (shake > 1f)     Camera.main.shake(GameMath.gate(1,shake,5),0.3f);
    enemy.damage(effectiveDamage,this);
    if (buff(FireImbue.class) != null)     buff(FireImbue.class).proc(enemy);
    if (buff(EarthImbue.class) != null)     buff(EarthImbue.class).proc(enemy);
    enemy.sprite.bloodBurstA(sprite.center(),effectiveDamage);
    enemy.sprite.flash();
    if (!enemy.isAlive() && visibleFight) {
      if (enemy == Dungeon.hero) {
        if (this instanceof Yog) {
          Dungeon.fail(Utils.format(ResultDescriptions.NAMED,name));
        }
 else         if (properties().contains(Property.MINIBOSS) || properties().contains(Property.BOSS)) {
          Dungeon.fail(Utils.format(ResultDescriptions.UNIQUE,name));
        }
 else {
          Dungeon.fail(Utils.format(ResultDescriptions.MOB,Utils.indefinite(name)));
        }
        GLog.n(TXT_KILL,name);
      }
 else {
        GLog.i(TXT_DEFEAT,name,enemy.name);
      }
    }
    return true;
  }
 else {
    if (visibleFight) {
      String defense=enemy.defenseVerb();
      enemy.sprite.showStatus(CharSprite.NEUTRAL,defense);
      if (this == Dungeon.hero) {
        GLog.i(TXT_YOU_MISSED,enemy.name,defense);
      }
 else {
        GLog.i(TXT_SMB_MISSED,enemy.name,defense,name);
      }
      Sample.INSTANCE.play(Assets.SND_MISS);
    }
    return false;
  }
}

Fixed version (ground truth):
public boolean attack(Char enemy){
  if (enemy == null || !enemy.isAlive())   return false;
  boolean visibleFight=Dungeon.visible[pos] || Dungeon.visible[enemy.pos];
  if (hit(this,enemy,false)) {
    if (visibleFight) {
      GLog.i(TXT_HIT,name,enemy.name);
    }
    int dr=this instanceof Hero && ((Hero)this).rangedWeapon != null && ((Hero)this).subClass == HeroSubClass.SNIPER ? 0 : Random.IntRange(0,enemy.dr());
    int dmg=damageRoll();
    int effectiveDamage=Math.max(dmg - dr,0);
    effectiveDamage=attackProc(enemy,effectiveDamage);
    effectiveDamage=enemy.defenseProc(this,effectiveDamage);
    if (visibleFight) {
      Sample.INSTANCE.play(Assets.SND_HIT,1,1,Random.Float(0.8f,1.25f));
    }
    if (!enemy.isAlive()) {
      return true;
    }
    float shake=0f;
    if (enemy == Dungeon.hero)     shake=effectiveDamage / (enemy.HT / 4);
    if (shake > 1f)     Camera.main.shake(GameMath.gate(1,shake,5),0.3f);
    enemy.damage(effectiveDamage,this);
    if (buff(FireImbue.class) != null)     buff(FireImbue.class).proc(enemy);
    if (buff(EarthImbue.class) != null)     buff(EarthImbue.class).proc(enemy);
    enemy.sprite.bloodBurstA(sprite.center(),effectiveDamage);
    enemy.sprite.flash();
    if (!enemy.isAlive() && visibleFight) {
      if (enemy == Dungeon.hero) {
        if (this instanceof Yog) {
          Dungeon.fail(Utils.format(ResultDescriptions.NAMED,name));
        }
 else         if (properties().contains(Property.MINIBOSS) || properties().contains(Property.BOSS)) {
          Dungeon.fail(Utils.format(ResultDescriptions.UNIQUE,name));
        }
 else {
          Dungeon.fail(Utils.format(ResultDescriptions.MOB,Utils.indefinite(name)));
        }
        GLog.n(TXT_KILL,name);
      }
 else {
        GLog.i(TXT_DEFEAT,name,enemy.name);
      }
    }
    return true;
  }
 else {
    if (visibleFight) {
      String defense=enemy.defenseVerb();
      enemy.sprite.showStatus(CharSprite.NEUTRAL,defense);
      if (this == Dungeon.hero) {
        GLog.i(TXT_YOU_MISSED,enemy.name,defense);
      }
 else {
        GLog.i(TXT_SMB_MISSED,enemy.name,defense,name);
      }
      Sample.INSTANCE.play(Assets.SND_MISS);
    }
    return false;
  }
}