Leon flies into the air, reaching high enough to watch the entire Heart Kingdom from the sky, observing as several explosions begin to go off in both the Noble and Common Domains. And he does nothing to stop this from happening, he just waits and watches, biding his time until every single bomb has gone off, and once that finally happens, he reacts.
Leon Chronos: Rewrite. (Leon said simply, the world around him begining to distort and fall apart, and moments later he just disappears, and so does the world around him)
Back at the meeting place of the heroes, some time before the explosions even began. Another Leon suddenly appears in the room, obviously startling everyone, except for the original Leon of course, who just turns back to face his temporal clone.
The elite mages are less frightened by this new Leon's sudden appearance, but the super knights are completely caught off guard, and armour up quickly.