Actually, U.S. air force already found Japan's movement by rader and other electric devices, and they divided into a team of interception and saving forces temporarily and they moved.
It devided light and shade that the difference of ability of intelligence between Japan who relyed on only watching by man for finding enemy to U.S. who developed many efficient rader.
In Japanese air force , bombers on warship of 108 second attacker which remained in fleet equiped usually bombs and attackers on warships equiped torpedos, and command of Akagi , a Japanese aircraft carrier , commanded that bombs of all bombers and attackers on warship change into bombs for land because they valued the necessary of 2nd attacking by the fact which there is no report of finding enemy's ship.
but a report entered that a plane searching enemy found a object which looks like enemy exactly at that time.
And another report says there are a object which looks like aircraft carrier, so command of Akagi commanded that all bombers and attackers on warship return bombs that had been changed before bombs that had been equipped before.
because of a judgement that bombers and attackers are in time if they returned their equippment.
Yamaguti Tamon, a major general in 2nd fleet of air force, he adviced command of Akagi that under such a condition , it is dengerous so they should leave as they are.