Although Ofran had reminded them to not spread any information about what had happened this day to avoid incurring the displeasure of Sir Ryan, who among the Elders of the Merlin Family didn't have friends and kin?
None of them wanted to see their relatives and friends offend Mafa Merlin because they weren't aware that they needed to be careful. He was a monster that they shouldn't provoke... unless they were tired of living. Not everyone had a father that could contend against that monster like Aube.
Thus, in one night, many of the Merlins understood that Mafa wasn't someone to pick a fight with, and that whoever did would run out of luck.
As for exactly why that was the case...