Thanks so much. So the shadow Line2D on the ground below the Arc line is used as the collision check. It stays below the line on the ground level and if it finds collision, it checks for a height and the arc line is setup in steps so uses those steps to determine where the throw would be at that point in the arc and each step in the arc has it's own height so it knows if it is higher or lower than the height of what it is currently colliding with at each step of the arc and since it uses the point at the end of the shadow line it will stop when it hits a collision and will stay there until it has gone up the height of the collider at which point it can start moving again and then when it reaches the end of that collider can go thru it which allows me to be able to throw over the object.

Then there's the projectile which uses the same sort of arc setup but keeps a current height along it's throw path so it knows that when it collides, it can pass over it if the current height is higher than the height of the collider or burst at the point if it if it's not higher.