Of course, this is a foreshadowing. Remember the illusion that the eldest son had when the whole family was fighting with aliens at the end of the movie? At that time, the eldest son found himself in the house sold by his mother (of course, this was an alien's spellcasting factor). First, it was discovered in the kitchen that his father had killed his mother by mistake, and then his father committed suicide, which represented his separation from his parents in the real life of the earth. Then in another room, he saw that his best friend was watching the porn with the little girl who had played kiss with him and told him to go away. This represented the separation of his relationship with his friends, and he should finally be separated. The only thing left is the relationship between him and his youngest son (the little gray people must be gratifying~ they can finally finish their work~), but at this critical moment! He was called back by his parents in the real world, and the alien’s spellcasting on him was also interrupted at the end. However, the alien still insisted on forcibly taking him away (maybe it was taking him to some kind of strange Dimensional parallel universe space, because the bright white light around the aliens in the film is a good example, and the space-time wormhole is opening...) And at the end of the movie, the reason why the elder son can communicate with the younger son through the walkie-talkie is because At that time, the alien’s spell-casting ceremony was interrupted during the younger son’s session, so he was able to maintain some kind of communication with the younger son. . .
So I guessed that the younger son in the sequel will definitely become the only bridge for the older son to communicate with the real world, and the older son will eventually be sent back, just as the old man said, it will become one of the few gratifying cases. (Congratulations, the 4th family successfully broke through!)
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