Barty liked it when people (or things?) fought back. But Meaghan was a little scary. He needed a break. - And he wanted to try the Cruciatus Curse on something more complex than an Elf.
This too was a draining activity that the boy couldn't keep up for too long. He had very little practice at this, especially with someone fighting back so hard.
He was sweating now. Barty shed his long robes. He was wearing nothing more than a pullover and jeans. He dropped his wand too and leaned against the far wall, taking a moment to catch his breath.