After the euphoria of a breath-taking, logic-defying Champions League encounter between Celtic and Manchester City had started to fade, there came a search for answers.
How, exactly, had a Parkhead squad that had cost a total of £19million been able to go toe-to-toe so impressively with the pick of a galaxy of Etihad stars that cost not far shy of half a billion to assemble?
How could the stock of the Scottish champions, whose first match in Group C had ended in a club European record 7-0 filleting in Barcelona, have risen so spectacularly a fortnight later against Pep Guardiola’s big City traders?