Program: 174559
Project: 174559
Buggy source:
/** 
 * Methods related to entity combat.                     
 */
public boolean attackEntityAsMob(Entity entityIn){
  if (!this.world.isRemote) {
    this.charge_ticks+=20;
    this.hit_count+=1;
    if (this.isCharged()) {
      AxisAlignedBB axisalignedbb=(new AxisAlignedBB(this.posX,this.posY,this.posZ,(this.posX + 1),(this.posY + 1),(this.posZ + 1))).grow(8.0,(double)this.world.getHeight(),8.0);
      List<EntityLivingBase> list=this.world.<EntityLivingBase>getEntitiesWithinAABB(EntityLivingBase.class,axisalignedbb);
      for (      EntityLivingBase entity : list) {
        if (!this.isOwner(entity)) {
          boolean shouldAttack=true;
          if (entity instanceof EntityGem) {
            EntityGem gem=(EntityGem)entity;
            if (this.getServitude() == gem.getServitude()) {
              if (this.getServitude() == EntityGem.SERVE_HUMAN && this.getOwner() != null) {
                shouldAttack=this.isOwnerId(gem.getOwnerId());
              }
 else {
                shouldAttack=false;
              }
            }
          }
          if (shouldAttack) {
            if (entity.attackEntityFrom(DamageSource.causeMobDamage(this),(float)(7 + this.rand.nextInt(15)))) {
              entity.motionY+=0.9D;
              this.applyEnchantments(this,entity);
            }
          }
        }
      }
    }
 else {
      if (entityIn.attackEntityFrom(DamageSource.causeMobDamage(this),(float)(10 + this.rand.nextInt(15)))) {
        entityIn.motionY+=0.4D;
        this.applyEnchantments(this,entityIn);
      }
    }
  }
  return super.attackEntityAsMob(entityIn);
}

Fixed version (ground truth):
/** 
 * Methods related to entity combat.                     
 */
public boolean attackEntityAsMob(Entity entityIn){
  if (!this.world.isRemote) {
    this.charge_ticks+=20;
    this.hit_count+=1;
    if (this.isCharged()) {
      AxisAlignedBB axisalignedbb=(new AxisAlignedBB(this.posX,this.posY,this.posZ,(this.posX + 1),(this.posY + 1),(this.posZ + 1))).grow(8.0,(double)this.world.getHeight(),8.0);
      List<EntityLivingBase> list=this.world.<EntityLivingBase>getEntitiesWithinAABB(EntityLivingBase.class,axisalignedbb);
      for (      EntityLivingBase entity : list) {
        if (!this.isOwner(entity)) {
          boolean shouldAttack=true;
          if (entity instanceof EntityGem) {
            EntityGem gem=(EntityGem)entity;
            if (this.getServitude() == gem.getServitude()) {
              if (this.getServitude() == EntityGem.SERVE_HUMAN && this.getOwner() != null) {
                shouldAttack=!this.isOwnerId(gem.getOwnerId());
              }
 else {
                shouldAttack=false;
              }
            }
          }
          if (shouldAttack) {
            if (entity.attackEntityFrom(DamageSource.causeMobDamage(this),(float)(7 + this.rand.nextInt(15)))) {
              entity.motionY+=0.9D;
              this.applyEnchantments(this,entity);
            }
          }
        }
      }
    }
 else {
      if (entityIn.attackEntityFrom(DamageSource.causeMobDamage(this),(float)(10 + this.rand.nextInt(15)))) {
        entityIn.motionY+=0.4D;
        this.applyEnchantments(this,entityIn);
      }
    }
  }
  return super.attackEntityAsMob(entityIn);
}