The Creeveys and Rabastan Lestrange
Tilting his head slightly and moving his wand side to side in a gentle sort of manner, Rabastan was hoping that the little boy would honestly say something. It seemed that he was just scared out of his wits. The thought caused him to smile broadly, enjoying the fact that he still could instill such fear easily within another. He had done it throughout the first war as well years ago. It felt different then just kidnapping a tasty young woman just to torture her brains out. To look into someone else's eyes and seeing exactly how scared that person was to the point of immobility, it showed himself that he contained more power then thought that he had owned previously.
"This isn't fun if you're not willing to talk to me, boy. It's a belly full of laughs if you do, I assure you," he replied merely to his own words after a bit of silence. Rabastan let out a small scoff of laughter before holding his wand firmly within his hand. It alls seemed too easily. Maybe all the students there were rusty from not being able to preform any defensive or offensive spells. No matter. After all, a death was a death to him. Each one soothed him and caused the aderenline within his system to run faster. It's one of the things that kept him going, which also made him jump into sitiations that everyone within the castle had currently been in.
"Expulso!" he yelled out and aimed his wand at the nearby pillar. Rabastan was boardline sadisitc, which was clear to see that he had wanted the battle to last a little longer than others. There was no one else up there with the house elf boy and himself, so there wouldn't be a need to kill him off the bat or use another unforgivable curse for his amusement just yet. As the blast emitted from his wand, he wanted the stone crumble, exploding in all different directions, and aimed well enough to land upon the boy.
If that didn't make the boy move and cause the battle to be a little bit more fun, then a quick death would have been the better option.