Anna raised her hand, an idea already forming in her mind. "What if we were about to cast a spell on an object and we needed to check our aim ahead of time to make sure we'd be casting the spell in the correct direction? We could check our aim for spells intended for inanimate objects," she said. Anna tapped her fingernails against the side of her leg a few times, trying to come up with a good example to prove her point. "Take aguamenti, for example. Let's just say we only needed to cast water into a certain direction. We could use the arrow to test the aim of our wand to see if, when casted, aguamenti would indeed go in the intended direction."