Rodolphus had never wanted to be home more than he did at this exact moment. A cruciatus curse would be a welcome escape from the end of his wand right about now. It would have disabled the boy enough that Rodolphus could have him bound and delivered. Yes, at home he was but a babe but the order still stood. Only the Dark Lord could dispose of the babe.
"You're parents are simply collateral," he spat as he stepped back from the child. As much as he would love to curse this brat he knew that would only cause problems. "They mean absolutely nothing," he moved tip of his wand to point at a nearby shrub. "You on the other hand should have died with them and saved us all the burden of your existence." He then uttered a spell that caused the bush to shrivel and die.
The power that began to course through his veins at watching the bush wither began the process of taking over him and he knew it would be a matter of moments before he couldn't contain himself. "GET OUT OF HERE," he screamed at the boy just before exploding a decent sized rock just off the road and not too far from where Harry stood.