The shield was a good step - and told Remus more about how Draco was changing that he had protected his friend before himself. He could hear that it was making the other uncomfortable, but it wasn't the kind of conversation that could be avoided. Not when it was dealing with something so very important.

"What experience do you have with memory charms?" he prodded further, gently, watching Draco's expression carefully here. "They are exceedingly dangerous given that they could so easily go very wrong."