Dylan nodded, confirming what he'd thought to be true. Of course she went ahead and performed it on herself without knowing what it was...."Merlin....? In the future...don't perform something on yourself unless you know what it is and what it does...." He was frowning at her...FROWNING. Dylan worried about her, okay? WORRIED. Just like he worried about Selina living by herself...with Vivi of all people...

Yea.

"I only really know four shields...Protego, which is like the most basic one...Contego, which is a fun one to know...Impiriano, which is the armor shield...and then the reversion shield. Professor Romanos called it 'Glass to Sand', though."

He'd used it to freak Oakey Gunter out once...when Dylan was creepin' him in Hogsmeade..."I'm not sure how helpful it would be in a situation at Hogwarts..." The Slytherin pondered on that a moment......"It takes a lot of concentration..."

Taking a deep breath, he whipped his wand out in front of him...ALL OF HIS BRILLIANT SEVENTH YEAR FOCUS......"Revertoscutum!" and then pointed his wand out in front of him. Yep, that was all it took. A point....It looked like some water was in the shape of a wall between the two of them....