Tonks

You yelled "I got Tonks."

But Bellatrix yell back with a madness in her voice "Keep back youngling I want a little chat with my niece."

She flied quickly towards Tonks and the Harry. You was right on her ass but not trying to look at her nice round tight, wait wait what am I doing you thought to yourself. Bellatrix threw a the Imperius Curse at Tonks. She dodge as the Harry on her broom grab her hips trying to hold on.

You knew you could help Bellatrix by capturing Tonks and the fake Harry. Bella might capture her by herself and you knew you could help Voldemort by going after someone else.