Rigel was overwhelmed by how fast the Players' reactions were when he tried to stab them with his spear. He used his Adrenaline Rush and even his Dragon Aura to immobilize them, but none of them worked because Alice was the one who controlled them. It felt like he was trying to cut a floating piece of paper and the moment he swung his spear, the paper flew away because of the wind.
His attack speed was supposed to be unavoidable, but because of Alice who controlled them, they dodged every attack he threw at them. He realized that his Adrenaline Rush was no match for Alice, but thanks to the lingering emotions that were attached to those Players, he found their weaknesses and how to deal with them.