Time
Many years filled with meaningful, often tragic events had passed since Khan last stepped on Ylaco's training ground. Back then, he was nothing more than a kid, broke, ignorant, and innocent. Yet, his return told him how much he had changed.
Khan saw familiar walls and details as soon as the teleportation ended. He knew that place, but his heightened senses made him experience it for the first time again. Also, his memory got in the way, leading to sad realizations.
'Small,' Khan thought, inspecting the area. 'Cheap.'
After witnessing all kinds of luxurious environments, Khan couldn't help but reevaluate the training ground's teleportation building. That place had looked majestic six years ago, but he only spotted flaws now. Moreover, it had become an ordinary sight in Khan's mind.