I think the fight would depend mostly on the psychology of the human. If they went into the fight knowing it's life or death, they might stand a far better chance than if they were just in for a spar. Because the chimps won't be holding back and they'll have no issue with tearing pieces off the human. The man would need to have that same psychology or else they'd be at a huge disadvantage from the get go.
There is a certain element of truth in that in animal attacks generally.
Most humans are not actually that used to fighting and will tend to hold back initially when attacked by, say for instance, Dogs, because there is actually a reluctance to hurt the attacking animal.
To have any chance of beating a chimp, one would have to act like one.
Your
very first move would have to be a full throttle Nuclear grade all out attack. Biting, Scratching, Gouging, Poking, Twisting, Screaming_Blue_Murder, kicking, and so on, with no let up until you are ether victorious or dead!
Because that is exactly what the Chimp will do and your
only chance of survival is to try to out-Chimp the Chimp.
The guy got dragged around like a doll and had to jump/fall in the water to escape. You can also tell that the chimp was trying more to scare him off than do any real damage.
