Some children turned backwards while in the audience.
Kids in the audience.
Children and kids are synonymous.
exists e1 x1 x2 x3.(n_audience(x3) & in(e1,x3) & r_while(e1) & Theme(e1,x2) & Actor(e1,x1) & v_turn(e1) & n_backward(x2) & n_child(x1))
exists x1 x2.(n_audience(x2) & a_topic(x1) & in(x1,x2) & n_kid(x1))