After Asilean's interruption ended and he stopped causing a disturbance, it was finally time for Lucy to explain how he defeated the buffalo leader.
He had just told them about the pebble and how that triggered an idea. Now he only had to tell them why it triggered an idea and what it reminded him of, as well as how he thought about how to do it before he could finally begin explaining his magic. It was a rare moment where Lucy's magic actually had some thought behind it, and he didn't just come up with it on the spot, so he wanted to brag about his superior intellect and insightfulness.
However, before Lucy could begin, Toz held up a finger and shushed him.
"Be quiet for a moment."
Lucy pouted at Toz's interruption, but he obediently listened and stayed quiet. He let go of his pout after a few seconds as he grew curious about what Toz was doing.