Oops, sorry to post twice in a row.

"Like, if you put the sensor between A and C but don't read it, the mysterious phenomenon still goes away, and the photon still always ends up at Detector 1."

Is this sentence correct? I thought the "mysterious phenomenon" was that photons never went to Detector 1, when you would expect them to reach it half the time. So if the mysterious phenomenon goes away, you should see half the photons at Detector 1 and half at Detector 2, not all at 1.

Or have I misread this?