Tonks stumbled back as the cobblestone beneath her blew up and outwards, several bits of shrapnel cutting at her bare limbs and even one against her cheeks, but it didn't blind her. Hell, it didn't even topple her. When push came to shove, Tonks had some bow learned to put her clumsiness behind her and kept tightly to her feet even as she had to leap back to avoid being knocked back enitrely. Her wand whipped around through the dust of broken stones and she cried her hex out onto the air.
"Stupefy!" She'd prefer to take the woman in unconscious but unharmed. After all, she was an Auror. They really were the good guys. But she had a sinking feeling a few stupefies weren't going to be enough to take her estranged Aunt down. Still, she had to try. Once her hex was off, she instinctively dove for a bit of cover, doing her best to make certain she was still conscious and on her feet to finish this fight, despite her aunt's greater years and experience than herself.