There was no need to look apologetic, because Echidna was giggling excitedly as she watched the two bicker and electrocute/get electrocuted.

"Hee... Are-- Are you OK...?" She managed to get out in between her chuckles. "I didn't know fairies could do stuff like that...!" Yep, she was basically utterly enchanted by the fact that Pixie seemed to be a fairy and was doing magic.