Unit launched as missile with terrain collision

[Klasus]

I have created an ability that launches the unit as a missile towards an offset point. It is supposed to collide when it's within unpathable terrain. The weird thing is that it only works once each time I load the map. Can someone please check what I did wrong?

The map:

http://www.mediafire.com/?nrewbnnwwd9q5mx

 

[Dr Super Good]

It seems the destroy effect is persisting across casts. I have no idea how that effect works, but will look into it.

 

[Klasus]

Thank you very much

Edit:

I also tried to replace the persistent effect with a behavior. The same problem is still there. Map: http://www.mediafire.com/?mpgy7smulkbthrg