What happens if you use Skarner's ultimate and then Flash?

Skarner's ultimate, Impale, allows him to basically grab an enemy and freely move around, dragging the enemy with him. But what happens if Skarner performs a Flash during this time?

Similarly, I'm assuming that using Ghost during this time would allow you to drag the enemy much further.

Obviously, this should be pretty easy to determine, but I don't have Skarner (nor am I interested in purchasing him at this time).

Solution 1:

Skarner can't flash while ulting someone; the ability icon greys out

Other moving effects, like ghost or an enemy push/pull will drag your victim along for the ride, though.

Solution 2:

You cannot use flash while using Skarner's ultimate. Ghost works as expected.