well they're called 'Killer' Whales, not 'Hugging' Whalesso an injured seal walks into a club...
seriously though. the seal feeds the shark, which in some cases, feeds the orcas. it's a recent discovery that orcas do prey on and eat sharks, even great whites.
actually, orcas eat the livers out of the sharks and discard the rest. they go for the good meat.
nature is metal.