I was not thinking about that dude, but the dude who gave Naru pistol for orange flower. He was pretending to be dead, didn't attack Predator, and Predator killed him.
And that idea that orange flower will give you invisibility on thermal camera, god such a stupid idea. Even if flower somehow lowers your body temperature, it will be by 1-2 degrees, which would do nothing for thermal view. If flower would somehow lower your temperature by some meaningful degree, you would die due to hypothermia. Also Naru couldn't know what thermal view is, and by following movie logic why Predator saw her in the final battle when he was without a mask ?
I can understand almost anything, except how stupid the Predator was. He was cocky, always roared like some kind of idiot, constantly visible, going in direct combat, standing there in the open, standing in front of the pistol, cutting his own hand, killing himself. IQ of this Predator was max 60-70. If Jungle Hunter behaved like this, he would be killed at the beginning of the movie.