Overprotectiveness
"Ah, this brings back memories... lots of memories..." Tatsuki muttered to himself as he felt like throwing up. He clutched his stomach in hopes that he won't spew anything out his mouth.
Seeing his father's ultimate form made him remember a couple of things from his childhood. That golden armor he wore, as well as the golden trident he wielded matched with his grey beard... it was something that traumatized him when he was a kid. Memories that he repressed started resurfacing in his mind and he couldn't help but take pity on his son who was about to get beat up by his grandfather.