Noah's spectacular performance had one sole purpose: gathering all the attention on him and increasing his value in the eyes of the Empire.
As for why he had done that, it was to instill some urgency in the soldiers on the battlefield.
Anxious persons would commit mistakes and that was what Noah wanted.
He had to create the image of the genius running away from the battlefield, forcing the other soldiers to chase him immediately, the Warp spell played an important role in the matter.
Since his teleportation spell made him completely disappear, leaving no traces of his passage, he could deceive the soldiers, making them believe that he had gone toward the depth of the continent.
Noah's plan worked, the remaining cultivators of the Empire quickly moved to chase him, he guessed that it would take them a few days to realize that they had been fooled.
'One week and there is still no trace of land. Well, my speed is quite low.'