That was another thing from the homework, if Toby remembered right. He could think of a great many advantages of this over the magical shield; possibly something to do with his usual preference of muggle methods over magic? Maybe. He raised his hand again.

"If you have the conjured shield, you can use it to deflect spells while focusing on using your wand to cast other spells. You can multi-task. I don't think you can cast other spells when you're trying to keep up a shield charm."