Luke snorted, "The Scourge?" he asked, "Unsexiest nickname ever," he felt his cheeks catching a fraction because he was preetty sure there was an innuendo that he'd walked right into but thankfully it was followed by an insult so he just elbowed Mickey in the side and called him and jerk and threw a second box of Lucky Charms into the cart for good measure.
He opened his mouth to tease Mickey about stumbling over the word marshmallows but it all went to the side when he'd needed to use his powers. Shaking his hands out afterwards, he rolled his shoulders and rubbed the back of his neck, dispelling the tingling in his fingers as he did. All of the conversation kind of stuttered to a halt and he lifted his eyebrow, trying for non-chalant sarcasm in the fact of embarrassment at having just used in front of someone who didn't know him. He reached out, fingers resting on Mickey's forearm, knowing that the residual energy was still brimming off him and he just looked apologetic.
"I- uh- yeah, sorry. Like I said before, you're not the only one with magic. Mine's just, uh, unique?"
"why though? What's wrong?"
He wasn't sure how to answer, so he just said, "Ghosts." Because that was the appropriate answer. He wet his lower lip and took hold of the end of the cart again, dragging it away, as if that was the end of the conversation though he was a thousand percent sure that Mickey wasn't about to just let it drop.