Solo.

'Two is one, and one is two. Assist or solo, decide, both choices can lead to victory, the answer lies near dust.' Isaac repeated the question in his mind.

'The answer lies near dust...' After repeating it a couple more times, he widened his eyes with a slam.

'All words are useless, except dust... Dust...' He remembered that the front desk was covered in dust, but what could be the answer to the question.

'Lies near dust...' Isaac scratched the back of his head and wondered what it meant.

He knows that he is one step closer to finding out the answer, but he didn't understand the proper meaning.

'Did I miss a clue?' He started having thoughts about missing to notice a vital part, but he was certain that he didn't see anything out of the ordinary.

''Answer is 3!'' Out of nowhere, Ormond stood up in a hurry and screamed the answer with a pale face.