...i used to live next door to this old lady with a gang of felines, so i'm able to speak cat.
the two cats were siblings. the girl hiding in the suitcase is the girlfriend of the dude who set up the hidden cam (he was out in the living room). the attack cat had beef with girlfriend from a while back when girlfriend clowned the cat's owner for buying them wet canned food over dry cat food. she thought ol' girl was out of pocket and needed to discipline her. the cats knew the girlfriend was hiding in the suit case, they just didn't think ol' girl would have the gall to try to prank them with their owner in the next room.
between each clawing, the cat was saying that she waited for this moment to get in ol' girl's s**t and just needed to get her alone away from their owner, she had no idea girlfriend would set up the fade herself. you noticed the bruh cat tried to grab his sis, but she slapped the fire out of him for his insurrection.