Yeah... I have no fucking clue how - I assume - both Yuuta and Shirayuki managed to flashback to the same childhood memory and, somehow, have a nostalgic moment together.
Neither can see each other, can't hear each other, and don't know they are fighting each other, nothing about their moves or actions would have prompted remembering that memory.
Is there some kind of freaky voodoo telepathy shit going on here? Oo