You observe the results even if you don’t observe the particle.
For example, I have a living room with a big dog in it. The dog can see me. He behaves well.
I leave the room, come back three hours later. There’s dog hair on the couch, the leftovers disappeared from the table, and there’s a trail of fluff from the destroyed pillow all the way to the corner where the dog is sleeping.
We didn’t observe the destruction, but we roughly know what happened.
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