Originally Posted by AssPirate

When In Doubt, Fire Wildly Into The Woods

When we learn it: After his first encounter with the Predator who has just killed his squad-mate, Mac picks up old painless and peppers the nearby shrubbery with bullets. The rest of the team soon joins in.

Why it's important: It takes a whole hell of a lot of bullets, but one finally catches the Predator, spilling some of his blood and providing an important clue. It's not the most efficient model for getting things done, but it's a lot better than sitting back and doing nothing.