Ok lets address that, since that's really what it boils down to. If the story is true, does that make Forrest a coward? Personally I don't think so. Too many people think that fighting for a living and taking damage is like another day in the office and it's not. This isn't like most other sports in that real physical harm can happen to the athlete.
If a person during a fight realizes that they are overwhelmed or overmatched, or injured/not in shape etc.. then they should not be riddiculed for knowing when to say "enough".
Most people here have never competed in MMA and I am sure a good % have never been in a fight, so who are they to judge? It's like the old war hawks that scream war but have never served a day in their lives.
"Let them see that their words can cut you, and you'll never be free of the mockery. If they want to give you a name, take it, make it your own. Then they can't hurt you with it anymore." - Tyrion Lannister