Apart from the bow Frank offered the second he saw Cain step out, he didn't open his mouth to speak as he followed behind Cain without attempting to strike up a conversation, knowing better than to do so after catching a hint of anger on Cain's face as he stepped out. Know your place, Frank! he thought to himself, aware that all he had to do was diligently serve and nothing more.
With Frank walking behind him, the servants around them parted to make way the moment Cain remotely came close to them, bowing their heads to show their respect as he walked past. Cain didn't spare them a glance, almost as though their entire existence wasn't worth noting, as he headed out the main entrance of the mansion.