Why did Jacob need to walk into the rain to get his memory erased?
At the end of Fantastic Beasts and Where to Find Them, Newt helps to obliviate all No-majs by using Swooping evil's venom. Somehow, I don't understand why Jacob only forgets everything he has done together with Newt when he's walking into the rain. There's a guy shown in the shower who seems to lose his memory, too and he's not standing outside.
Best Answer
The rain water contaminates the water in the pipelines and/or overhead storage tanks of the buildings in the city.
As you mentioned, a guy in the shower loses his memory. There is also a shot of a woman drinking from a tap who also loses her memory.
Observational deduction and I don't have any links confirming this.
Pictures about "Why did Jacob need to walk into the rain to get his memory erased?"
Why did Jacob Kowalski lose his memory?
As Scamander's romp through New York City turned into a full-blown crisis for the magical community, Kowalski stayed by his side. At the end of the movie, Queenie Goldstein, a witch who developed a romantic relationship with Kowalski, erased his memory.How did Jacob not lose his memories?
Jacob did not lose all his memories because he was bitten by a Murtlap. The Murtlap is a ratlike creature found in coastal areas of Britain.Why did Obliviate not work on Jacob?
The reason why it didn't work on Jacob Kowalski, because the venom doesn't really obliviate everything except bad memories and he didn't have any as he said in Fantastic Beasts: the Crimes of Grindelwald.Did Jacob Kowalski lose memory?
1. Jacob's Memory. At the end of Fantastic Beasts and Where to Find Them, No-Maj Jacob Kowalski's memory is wiped of the magic he witnessed by the rain containing Swooping Evil venom.Taeyeon - Time Spent Walking Through Memories + [English subs/Romanization/Hangul]
More answers regarding why did Jacob need to walk into the rain to get his memory erased?
Answer 2
Also, they could've easily obliviated him instead of making him walk into the rain, but I think that wasn't how it was shown because that would mean that the characters proactively wipe his memory, and I think none of them had the heart to do that. Which is why making him walk into the rain was possibly a kinder thing to do.
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Lisa, Jean-Daniel Francoeur, Donald Tong, Klaus Nielsen