Cape Town bathers and beachgoers have been warned to stick to swimming at beaches protected by life guards after two attacks on Saturday — one by a seal and the other by an as-yet-unknown small marine creature with teeth, suspected to have been a shark. National Sea Rescue Institute spokesperson Craig Lambinon said the two latest incidents were unrelated, with the first having happened at Blue Waters in False Bay and the other at Bloubergstrand’s Big Bay. The City of Cape Town’s water rescue network was activated by the NSRI’s emergency operations centre at 1pm on Saturday…