What does Arnold's quote “Poor Sport” Mean in Predator (1987)

Question

In the movie Predator, near the end, after they try to trap the Predator in that net, and it shoots its way out, a lot of them die. One guy is badly injured, so Arnold and that girl help him walk. When the woman tries to pick up a gun, Arnold tells her not to because the predator didn't kill her before because she was unarmed, then Arnold calls the Predator a "no sport". How is only fighting armed people being a poor sport? Did Arnold ad lib this and fail badly?

Answer 1

It means exactly the opposite of your take on it. I think Arnold said "No Sport" to indicate that if she was unarmed, she would be too easy to kill; not sporting. If she was armed by picking up the gun, the Predator would consider her to be true sport, in a fairer fight.

Here's a sound clip of a quote from Blade Runner that conveys the same message more clearly:
Roy Batty: "Not very sporting to fire on an unarmed opponent."