Question about delivering twins, one breech, one not?

My baby A was head down and low, "perfect positioning" according to my midwife. Baby B was that way as well.. last week. Yesterday during an AFI U/S., we saw that baby B is breech.. again. It was a bit surprising because I'm 34 weeks with the twins and the tech could not figure out how he had turned with so little room. So. Obviously we all hope ( me, midwife, OB/Gyn, perinatologist, etc) that he will turn head down again, and we will have another U/S next Thursday ( for sizing). However, time is running out, and I'm concerned that he'll stay breech. Te OB/Gyn told me (before we had gotten the U/S done) that Baby A could be born lly, then he would break my water, and whatever part he grabbed first would be the way Baby B is born. That's concerning me. Is that safe? And, um... he's co-managing with my midwife, so in reality, SHE would deliver unless a c-section is necessary. BUT... I'm freaking out because Dr.Grey is telling me that I HAVE to get ( there's more)