Me and my husband are playing assassins creed to and we are stuck!!?

We are on sequence 5 and are at the part where Damian blacks out and wakes as altier and chases the girl to the tower.. Once we start to climb the tower we get to a certain spot and can't go higher.. We know it is because we have learned the climb leap but it says that is in sequence 7... So how the heck do we get to sequence 7????