darinda came back into the great hall,and got a drink.she peered over at some ones potion book,and remembered-*gasped*"I forgot my potions book!"she said lightly.she did not worry about it to much,because she knew that profesor snape locked his door when not down there,so she went out of the great hall,and up the mabel stair case,and thought"maybe i should check if snape locked his door,just to make sure".she said to her self.
"profesor??"darina swallows her pride,and"alohamora"she opened the door,and she saw no one."hello??"she did not understand.she looked on the floor were she was in class,and saw her book.she nelt down to garb it.she got up,with her book,and said"I saw i heard some one here-"she looked around one last time,and then left.she slowly closed the door,and slowly walked up the stairs.
*turns to the lab and draws wand as we both approach the door*
"oblittero-tracks"
"just in case Snape trys to scan for our foot steps or finger prints"
For those who think i'm making this stuff up:
Obliteration Charm
"oblitesco" - L. to conceal oneself
"oblittero" - L. to cancel , blot out
Removes traces or tracks left by someone.