I was just pointing out that it was a bad comparrison. It isn't hard for a man to kill a Lion at all with a gun, and a gun sure ain't a shoulder cannon, meaning it'd be even easier. It is (or should be (take note AVPR)) hard for a Predator to take out an Alien, as it's strength and speed are negated by the Aliens, leaving it's only advantage being its tech. I say 'only', but it's tech is a fair advantage if used correctly.
A better example for me would be more a Great White Shark (Alien) versus a man, with some serious weaponry and armour (Predator), in the sea (hive, spaceship, possibly jungle?). The guy could do it, but he's severely disadvantaged.
BTW I'm thinking about this in terms of a confined space as obviously in an open one the Predator will always win (assuming it has a SC).