It is not oblivious from description. The spell connects 2 or more units. But what is the point of doing that?
the ones with the soul-link effect will get a different amount of damage: the damage is split between the two units. So this is effective on scouts and munchkins, and if you don’t want to get damaged to much, you could do that with one of your own units like a soldier, as it has a lot of health (when that gets attacked you’ll get damaged too).