Actually, don't need the Saint-14--any bubble Titan can do it even on hard mode. Just get on the rock and snipe Ogre. Put up a bubble only when the Ogre starts shooting, usually after coming around the second rock to the left of the lamp where he spawns. With Bastian, the bubble should last to about 1-2 seconds before the bridge is fully formed. As soon as bubble pops get down behind the rock and start towards the bridge. Just as you get to the bridge, it should be fully formed.
I think most people have a bigger problem with jumping onto the shelf with the Titan... I "cheese" by using a Mida, and selecting "Increased Height" jump. Makes it a cinch.