Adrian was very pleased when he saw Augustus had arrived. The older man didn't know why he had brought Arthur Weasley to his presence, but hopefully he would like what Adrian had had in mind.
"Sir, thank you for coming," he said with a polite nod. "I brought him to you in hopes he would be useful to your research. I figured a wizard like him would be of some help." He knew he could've gotten the blood himself, but he felt he would've liked to do the honors himself.