You can tell a lot about how your audience has received your arguments from the questions they ask in return. Specifically, they reveal two things:

The part of each side's argument that stuck with them the most
The underlying assumptions that informed their response to those arguments

The first question, for example, (why can't you stay in the EU if you leave the Eurozone?) which was put to the NO team after they made exactly this claim, shows that this point could be important to that audience member's final decision. But, because they're still not convinced it is true, their vote is still up for grabs.