Confront Petra directly

Steve entered the bridal boutique in his full Captain America gear. Petra was a business woman, she’d likely try to cut a deal with SHIELD and give herself in when Cap showed himself.

“Can I help you, my dear?” Petra said, wearing her patented black blazer and red dress. She looked Russian and had the demeanor of an ex-Supermodel.

“I’m Captain America,” Steve said, “I’m here to take you in. For suspicion of **** and human trafficking.”