Atlan made a contract with the three good fairies. In exchange for fighting the Dragon Queen Malificient, then they would lend him their powers, allowing him to surpass his current limitation of power and reach the Specialist level.
But at that moment, his strength dropped back down to the Student level. It was as if the contract was voided for a brief second, which was enough of a time gap for Tulip to escape from his grasp.
Atlan couldn't interpret this any other way. The three good fairies wanted Tulip to surrender herself to the Queen!
He couldn't understand this. He thought that they cared deeply for their daughter, but this action led him to believe that they wanted her to be killed!
His eyes and expression displayed the anger and frustration he had for them. He demanded answers.