They bite the livers out of great white sharks while the shark is alive for sport a little bit like the way hunters do with deer and antlers.
They knock them unconscious by applying trauma to the head and then use their teeth with surgical precision.
Great white sharks actively flee when orcas are around. They never display behaviour like that to anything else.
tl;dr
the shark fears the orca
they’ve even been teaching each other to hurt humans because some people were mean to them. watch your backs when you’re at sea bro you never know when you’re being gang stalked by an orca pod.