Reverse masking

Hey,

I have a file where I need to mask in a line. Which is fine.

However as the line is being masked in i also need it to be masked out.

Right now I have it is setup so that when the first mask finished the reverse mask starts and makes the line disappear.

Now I need it to start reverse masking sooner than when the first mask is complete, to give the effect that the line is wisping through the air.

Hope this makes sense, any help would be appreciated.

Thanks