Though they may be fused with 2 different ponies, the ever strong bond of love that was between Shining Armor and Cadence lives on through Home Defense and Luminescent Love. Somehow despite them being their on ponies, they can not help have this feeling, this attraction to one another that they can not explain. How despite he being a calm reserved apple farmer and part time guard and she being the princess of both love and of the night, they still carry this bond that transcended beyond the two ponies whom originally had it. Such is why we get beautiful adorable moments like this where an awestruck princess whom though despite her combined age is taken aback by the brave strong and faithful stallion from such humble backgrounds. Catching the mares eye as she did his, the bond of old flourishing anew between these vastly different yet similar ponies.