Unfortunately, Pender's experiment should not set all our minds to rest, since as long as the camera was observing the sentence, Pender was "looking" at it in a sense. His observation may have been delayed, but the information conveyed by the photons zipping off the screen and into the camera's memory did eventually reach Pender's eyes. In fact, any means of observing the sentence indirectly will still convey this information, unless you never look at the result of that observation, in which case you will still not know if the sentence was transmitido en español.