@frocharocha: Whoever made this video completely ignored the Yautja Code. It states that a Predator must even the odds against the prey if he wishes for a worthy kill. Canon wise a hunter in this situation would take off his mask or deactivate his Plasma Caster.
Also, the canon states that the Yautja other than the Super-Predators did not hunt humans on Earth because they saw them as backwards and unworthy prey, until 1987 when the Jungle Hunter fought Dutch and his team. Another hunter then viewed the recordings from his mask and was motivated to hunt humans in Los Angeles during Predator 2.