I'm aware it's a GEV but looking at that picture somehow I immediately thought of 2 things,
1) It's flying towards inland rather than towards the sea. (not sure why I thought of that).
2) Is it possible to somehow deduce the height it is flying at based on that picture.
Of course a couple of hundred km range isn't practical as a delivery vehicle for a land attack payload except for hitting the shore targets.
A wild guess, assume the delivery GEV releases the torpedo, torpedo flies into the water towards target. Delivery GEV continues flying in a circular loop (likely can't fly slower than the torpedo can swim) to delay itself and let torpedo hit target ahead of it. The GEV follows behind one or two minutes later to take and send back damage assessment pictures. After sending back pictures, GEV kamikazes into target. If GEV hits, good. Else wasting some defence missiles or CIWS bullets and complicating matters for the target is better than letting a possibly 1ton of remaining structure sink into the water.
But if torpedo misses then GEV would be warning target that it is under attack. If torpedo misses and GEV was designed to just sink into the water out of sight, target may not know it is under attack and 2nd or 3rd torpedoes would still have the element of surprise.