Celestia couldn't exactly pinpoint what had changed between herself and her Advisor, but... seeing Arnon actually hold his own, even if it went poorly almost instantly... there was a flutter in her chest that their flirting just couldn't quite keep up with. But, that's where her foolishness yet lied, to get over-excited and harm one she grew too close to. Or maybe she simply had fun unabashedly doting on him.