It's possible the company is going through A's group first, then will get to B's group later. Some companies, and teams, unfortunately get so busy that they are

It's possible the company is going through A's group first, then will get to B's group later. Some companies, and teams, unfortunately get so busy that they aren't able to respond in a timely manner. The other scenario is probably one you're worried about - that B dropped the ball somehow and none of his interviews are being considered. You can try emailing B with a generic probe, then emailing another person within this company's recruiting team a few days later (assuming you have the contact info of another person). A generic probe: "It was a pleasure speaking with you on $INTERVIEW_DATE. I'm excited about the possibility of being a part of $COMPANY_NAME and eagerly await your response. If you have any additional questions, please don't hesitate to ask. Thanks."