Anyone who hears the explanation of Patronus 2.0, but is unable to cast it, will lose the ability to cast Patronus 1.0 and be left defenseless. Most people will not be able to cast Patronus 2.0.
Anyone who hears the explanation of Patronus 2.0, but is unable to cast it, will lose the ability to cast Patronus 1.0 and be left defenseless. Most people will not be able to cast Patronus 2.0.