What does Anna do when the circus tent pole is struck by lightning?

When the circus tent pole is struck by lightning, Anna does a number of important things. First of all, when Harry does not catch her, she realises that something is wrong and she removes her blindfold. Secondly, she watches as Harry moves past her, on the wrong side, and suddenly realises that she must choose between saving her husband and saving her unborn child. (Remember that Anna is seven months pregnant.)
In that moment, Anna chooses to save her child: she changes the position of her body, twisting forward towards a heavy wire which she grabs hold of. The wire is extremely hot because of the lightning but Anna is able to safely descend to the ground. She does, however, suffer burns to her hands from the wire and a broken arm as a result of an "overeager rescuer" but is otherwise unharmed.