Originally posted by Kris Blazetrue, but Superman's range of vision is far greater than Thor's
Superman can't attack anyone outside the range of his vision either......Not that it matters at 1km distance.
also, the limit is that they won't fight any closer than 1km...but nothing stipulates that they can't move farther than that distance
Superman can just move to a distance where he can be sure Thor can't see him and blast him with hv all day