As said in another training field: It appeared that his master, Madara "Chris" Uchiha, had somehow knocked out himself out due to a massive amount of weed intake as there was a clear lack of control over the dosage nowadays. Don't do drugs, kids.
"Drop your kunai. It is not necessary." Even from a distance, Obito could sense the anxiety and fear with which the young shinobi had regarded the clone of Madara Uchiha. Reaching into his cloak, he casually incapacitated its head as he walked forward to meet his new student. "...Black Star, I take it? As there are some...unnecessary complications, I am now your replacement teacher. Rest assured, as I am more than capable." Obito paused a moment, silently scrutinizing the younger Uchiha. A single tomoe was apparent in his crimson gaze signifying that Black Star had already awakened their clan's Kekkei Genkai. "At this point, you have probably found the capabilities of the Sharingan rather useful, however, you are from being able to use it at a mature level." Obito brought both his hands up, placing them together into a single seal. "Now, I will proceed to execute a series of actions. Take careful note and utilize your Sharingan's prowess to your best extent to execute suitable actions."
Obito took several steps, distancing himself from Black Star until he counted about eight meters. Then, a familiar action taken too many times before, Obito released a wave of chakra that flowed into his student, successfully infiltrating Black Star's chakra system. Within moments, the forest that they currently stood in appeared to flicker as the trees were placed by large stone pillars. The free flowing grass beneath their feet died away to reveal dry dirt that rolled gently under the influence of a light breeze in the air. After assuring his student was completely engrossed in the sudden change of his surroundings, Obito counted a few seconds before opening with a dash forwards and making a direct beeline towards Black Star.
Upon reaching striking distance, Obito pulled his right arm backwards. His left foot pressed firmly into the ground, assessing his forward momentum as his dominant hand curled into a fist. Eye focused upon his student's left shoulder, he delivered a solid punch directly aimed at that very spot. "So, do tell," Obito questioned softly within audible range. "What drives you to attain further knowledge about our clan? Why and what exactly...are you fighting for? Dictate to me the worth of your very life..."