Great Tiger was surprised and felt a powerful force crashing against him, making its way to his brain. After a second, the force managed to overcome his willpower and put him in a susceptible state of consciousness.
"Sleep."
That command reached the deepest part of his mind and instilled in him an intense desire to let go of everything, close his eyes, and fall asleep.
"NO!" Great Tiger shouted as he fought with everything he had that compulsion.
A harsh life had granted Great Tiger a powerful will, so he was able to overcome that drive implanted in his mind. Actually, he could have resisted from the beginning, but he was so sure of his victory against the boy that he lowered his guard.
Although Great Tiger regained control of his mind, that did not mean everything was fine. Fighting off that compulsion granted the boy all the time he needed to burst with immense power.