It is highlighting the '3' in the previous sentence. That is, the first statement says someone has come forward. Then he says, "that makes 3." The response is essentially, "Wait. What? '3'! You mean there are two more than the one you just told us about? Why has nothing happened yet!?"
It is highlighting the '3' in the previous sentence. That is, the first statement says someone has come forward. Then he says, "that makes 3." The response is essentially, "Wait. What? '3'! You mean there are two more than the one you just told us about? Why has nothing happened yet!?"