If Potter were an alien, many of the details in the film would make sense, including the ineffectiveness of the drugs, the slow pulse, the ability to see ultraviolet light, the superb knowledge of astronomy, and the disappearance of Beth. If not, just another split personality of Potter, how to explain the above details.
The drug's ineffectiveness and the ultra-slow pulse could be explained by Potter's sluggishness and incoordination, with slow-moving animals generally having slower pulses.
Seeing ultraviolet light and rich astronomical knowledge may be the result of long-term astronomical observations.
As for Beth's disappearance, he disappeared for three days before Potter claimed to take advantage of the light. I believe that during these three days, Potter found a way out of the mental hospital, and on this day, helped Beth leave.
I thought that he would jump off the building on the 27th, but as a result, his own dual personality re-exited. Potter is an alien is a romantic idea, well, maybe it's possible.
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