Wildly
Leonel had no idea that his mother was currently speaking with his grandfather about such things and he also had no idea that his grandfather actually knew so much about his life. It would be hard to tell how Leonel would react to such a thing.
It was an odd coincidence, though. Leonel's mother might have contacted Leonel directly to tell him to go to the Luxnix family, but Leonel wasn't currently in Earth's Fold of Reality so the Princess hadn't been able to use her World Spirit to find him and could only speak with Emperor Fawkes.
But, maybe this was for the best. If Leonel had to be hounded by his mother about what happened with Aina, who knows how such a thing would end.
This aside, the current Leonel was still thinking about Bronze Force, imagining the ways that it could be applied and used.