Aljur took the chance to lecture Leila about the complicated relationships of the upper families now that they are in the topic. This is his investment for their future mentorship. That he hopes that with the knowledge she will not be hoodwinked by some idiots.
If that happens, who knows if he could hold back himself from raging. This is the student he acquired after some planning and hard work! He will never be reconciled if some late comer will snatch her when she is already in his palms.
Whether Leila wanted it or not, this day has cemented their fates. That their person's historic (reluctant) relationship has helped save many lives in the future. Saving people in an unlikely manner all of those who knew their complex relationship never expected. And of course this is a story for another day.
