That is exactly the one.
I had seen an amazing episode of “I Shouldn’t be Alive” about a boat that overturned in an african river. One person attempted to swim to shore, but he was badly maulded by a croc.
He lay by a tree on the shore slowly dying. During one of the nights, one of these buffalo walked right up to him. he thought he was going to die, but the buffalo layed down about 10 ft from him, which was apparently so far beyond their normal behavior in the presence of a human. At some point, the man fell asleep. He woke up the next day alive and covered head to toe in driver ants, but the buffalo had gone.
From the way this story was presented, it almost seemed like the buffalo guarded him during the night, but can’t be sure on that.