All this time, Sam is observing both of his students. Aryan and Veena evenly match and nobody gets any advantage in this matter. Even though Veena is stronger compared to Aryan, Aryan has more powerful techniques compared to her.
This is the reason that both of them did not get any kind of advantage while they were fighting against each other. From the start, both of them try to find the weakness of each other and try to attack that weakness.
Like this, finally, both of them decided to win the fight by attacking each other while creating their final attack. Surprisingly both of them decided to combine their all techniques to create a powerful attack. Naturally, both of them still decided to hold back. They can still increase the power behind Those attacks but it would be completely unnecessary for them to increase the power behind Those attacks.