Need help with a trigger...

I need help with making trigger that makes all ethereal units move back into their current position with the move unit instantly to... Because I have a trigger that turns a unit ethereal, summons 6 monsters that cast death coil on the target then dissappear. I don't want the ethereal unit to run around so I need a trigger that constantly pulls them back into a point. The problem is I tried using a unit group trigger that makes the ethereal unit move there instantly but I want to see it sliding like in a knockback. I also can't find a trigger to detect when the unit doesn't have the ethereal buff any more to stop making it go to its previous position instantly.

actually, you would have better results prevent the running back, that's an AI thing, and as long as your dummy is not invencible when the damage is done you can do it. You can then make it invulnerable again.

If you keep moving the unit to that position it would look horrible.

You can also adapt the spell so it knows that the unit will run away. Or just stun the unit

Maybe instead of stunning it just pause it?

The spell is supposed to look like this. The target unit turns ethereal, 6 void walkers come out and cast death coil on the target then dissappears. During the spell, the owner of the target unit would try and make their unit move away so they start running while they are ethereal. However, even when u make the speed reduction of ethereal to 10, the unit still moves pretty fast which is retarded. That's why I need a trigger that makes the target unit continuously slide back into the point he was when the spell was started. Plz help me because I thought ethereal would do the job but it doesnt.

acid bomb with 99% move speed reduction?

Or ethereal with 100% speed reduction...

EDIT: However, if you want to have the "running away" effect to the spell, save the unit's position to a variable, and then every x.x seconds, move the unit to the variable location, and order the unit to run towards.. whatever.