In the first hour, the Father would not accept Jesus’ plea to remove the chalice because the cross would destroy Satan’s kingdom. In this second hour, the Father will restore the cross as a fresh living power.
The Father chose this because no other event will be powerful enough. The Holy Father and all with him will die in Mary’s second hour. This shedding of blood will reenact Calvary and Mary will be the preacher, reminding the world of the Fatima vision. The whole Church must prepare for this second hour.