To be like ALIENS, but with a few Predators thrown in there. Could be that project O.W.L.F. have sent a branch of marines in after a last known sighing of a Predator, in a set up hunting grounds in which they deliberately let loose some mercs to go rampant on some colony planet, or something, once the Predator takes the bait, its up to the marines to try and capture one of them for their technology, problem is, the predators capture some of them, infect them with some face huggers they have on ship and release them back with their marine team to burst, so the predators have me some fun tonight, problem is, one has a queen infected, or an alien that transforms.
There should be no grappling with alien and predators, no swinging around. Should be, if an alien grabs a pred, the pred dies, or, the pred just pushes it away, the damn things have an exoskeleton after all.
I don't know, more creative than AVP:R.