updateHeroPetPosition () {
    if (this.lanks[HERO_PET] && !this.lanks[RIGHT_LANK_KEY]) {
      this.removeLank(HERO_PET)
    }

    if (!(this.lanks[HERO_PET] && this.lanks[RIGHT_LANK_KEY])) {
      return
    }

    const petThang = this.lanks[HERO_PET].thang
    const rightThang = this.lanks[RIGHT_LANK_KEY].thang
    if (!rightThang.stateChanged) {
      return
    }

    petThang.stateChanged = true
    petThang.pos = _.clone(rightThang.pos)
    petThang.pos.x += this.heroPetOffset.x
    petThang.pos.y += this.heroPetOffset.y
  }
Custom update method that pins the hero pet to the right
character if it exists, by updating the hero pet thang.