Days passed and neither party had made a move. Silvio, although he believed that his strength was superior to the Heavenly Palace, he was a meticulous man and did not act without being completely sure of success, so he preferred to wait and gather more information before making any move.
Andrew following Oliver's advice did not immediately contact Nadila to find out what she could offer and what she wanted in return. Oliver advised this as it was a commonly used tactic in negotiations.
It basically consisted of waiting a reasonable time to sit down to negotiate, because in this way they showed the other party that they were not anxious or hungry to obtain what the other party had.
Andrew knew this tactic well, after all, he was a business manager in his past life, however, knowing it and applying it were two totally different things, so if Oliver hadn't reminded him, Andrew probably wouldn't have applied it.