It hadn't been quite as easy as he'd have hoped to track the errant runaways. Rodolphus was excellent at tracking, could follow a quarry's magic across countries, but muggle towns and their cleverly not using magic as much as they might have... it slowed him down. He butchered for teenagers in a small village near the coast, thinking they were his capture, but they had turned out to be muggles and he had nearly had to start from the beginning again. If they got away... but he wouldn't think about that.
In the end, when he did find them, it was only the youngest boy he caught. He'd found them in Manchester, the train station packed with muggle filth. He'd tracked them there and found them separated, which was a bonus to his hunt, but as he'd closed in on two of them he was sure he'd been spotted when they tried to make an escape. Still, this close, there wasn't much one could do to successful escape Rodolphus Lestrange, and mid-apparation he managed to ensnare one of them. He'd been hoping for one of the girls, but the young man was almost as good a catch as he ripped him away from his side-along partner - his sister, perhaps? - and quickly apparated away with him himself.
He was young, and quite talkative when prompted with the right sort of encouragement. Rodolphus was a very patient man when it came to torture, butr in the end he did not have to be. Half an hour later, his message was sent just to the girl, written in her brother's blood.
He is still alive if you return with me. If not, you murder your brother. I leave the choice to you. Outside the train station in two hours, or your brother dies far more painfully than you can dream.