Follow the linear path until you meet a broken track. Cast Growth at the plant and continue upwards. Go east until you reach another part of the cave. In the next map everyone would shout Tyrell and another short scene about Psynergy Vortex. To reach Tyrell, just follow the only path and cast Growth at the plant to help you head down near the Vortex and near Tyrell. Throw a Fireball at the flower and you would battle with it.
After the battle, there would be another short scene about Tyrell and repairing the Soarwing. Go up the stairs and enter the northeast door. Follow the linear path to the outside. And yet continue with another scene.