The fish they punched most were the groupers
“Sounds as if they earned it, though, as the groupers tended not to contribute much to the group and instead loitered opportunistically nearby to exploit the work of the rest of the team.”
"The [octopuses'] exhibited range of partner-dependent behavioral flexibility, especially concerning the use of social information when deciding to switch foraging strategies and whom and when to punch, indicates that day octopuses have hallmarks of (heterospecific) social competence and cognition," the researchers write in their paper.