A leopard seal is one of the very last predators I’d want to be anywhere near. Wiki says [edited]:
leopard seal attacked a member of Sir Ernest Shackleton’s Imperial Trans-Antarctic Expedition of 1914–1917, when the expedition was camping on the sea ice.[45] The “sea leopard”, about 3.7 m long and 500 kg, chased Orde-Lees on the ice. He was saved only when another member of the expedition shot the animal.[46]
In 2003, [a] biologist… of the British Antarctic Survey was killed by a leopard seal while snorkeling
Leopard seals have shown a predilection for attacking the black, torpedo-shaped pontoons of rigid inflatable boats, leading researchers to equip their craft with special protective guards to prevent them from being punctured.
[However] Paul Nicklen, a National Geographic magazine photographer, captured pictures of a leopard seal bringing live, injured, and then dead penguins to him, possibly in an attempt to teach the photographer how to hunt.[50]
So I guess if you’re lucky they might try to train you up, but that’s a lot of weight to gain even for the average middleaged mountainbiker…