"Kid, we have a lot to discuss".
"I've been waiting for 4 days, Queen Heareth".
[You have activated skill: Advanced Electroreceptors.]
After activating the skill this time, Sebastian actively manipulated and spread it out, extending it to the surroundings which enabled him to survey the whole area. He quickly confirmed that Queen Heareth came alone.
Of course, his electroreceptors didn't get any signals didn't mean that other sharks were not here.
For the record, after he knew about the phenomenon of origin laws, he would be naïve to compare his attainments with this skill with old monster Great White Sharks like Old Mak who lived with this ability their whole old lives.
All he knew was that the fact that the other sharks didn't reveal themselves meant that a ploy or something of the sort was in play.
As for him, he just had to play along since the appearance of Queen Heareth alone was a good sign of goodwill in his favor.