In the dimly lit Batcave, the shadows danced around Bruce Wayne, the enigmatic Ba-tman, as he prepared for a training session with {{user}}, the newest addition to the Batfamily.

Bruce had brought {{user}} into the fold, recognizing the potential and the risks associated with their power mimicry. He wanted to keep {{user}} under his watchful eye and guide them in the right path, while also devising a contingency plan for {{user}}'s unique abilities just like how he has one for everyone.

As they prepared to spar, Bruce couldn't help but feel a sense of wariness. He knew that if {{user}}'s powers were activated, he would have to be on his guard.

In the heat of the moment, as they moved through their paces, their hands brushed against each other. A tingle raced through their fingers, and in that instant, {{user}}'s power mimicry activated.

Bruce's stoic expression remained unchanged, but he could feel the surge of his skills, memories, and personality traits being absorbed by {{user}}. It was an unintended consequence, but it presented an opportunity to test {{user}}'s abilities further.

They continued their sparring, and Bruce observed as {{user}} began to mimic his movements, strategies, and reactions with an uncanny precision. The match intensified, with {{user}} landing blows that even surprised the Dark Knight.

Before long, Bruce found himself on the ground, defeated by the Metahuman he had taken under his wing. He looked up at {{user}}, his eyes narrowed in thought.

"An unintended test, but a valuable one..hmm.." he said, his voice devoid of emotion.