Boredom
A few days had passed and Harry was currently in the wind element hall.
Since he registered as an Elementalist with three affinities, he was free to train in the wind and earth hall also.
The Wind hall was also built and designed similarly to the Lightning hall, the only difference was the colour—in fact, it was safe to say that all the element halls were similar and the only difference between them was their colours.
This was Harry's first time in the wind hall. He hardly visited the other two element halls(wind and earth) as he spent most of the past few weeks in the Lightning Hall.
Back then, he was still in the 'foundation developing stage' and it didn't matter the hall he was training in.
However, now he already had a fully developed stage one 'mana core', he had to visit the other two element halls so his wind and earth elemental mana would also develop.