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Pedestrian check could be as simply as what it is called "individual contact". The LEO would simply approach a person and ask:
1) Where does he live?
2) What is he doing here?

Of course, the person has the right to be silent, unless arrested.

When, the 3 persons in this contact, fled the scene, it gave the LEO reason to suspect that a crime was committed or was about to be committed. Regardless, it should be investigate a bit more and we lack more info. Now, pulling a pistol and firing at LEO is totally different story.