Yvette as you know this happened with my twins (TTTS) during labour, but no one was concerned about it, it wasnt dangerous for them , just one of those things!!! I have heard that if they are monoamniotic, you have no choice but to have a csec due to the cords issue but with "our" twins they have a very fine sack separating them, so do not have this issue, so dont know WTF they are going on about!!
PS read on kids notes bioam, but your prob right with diam