One possible scenario could be when Lupin has to leave Hogwarts due to his werewolf secret being revealed more widely. He might cry because he has found a sense of belonging there, with his friends and students. He loves teaching and seeing the young wizards grow, and leaving all that behind is heart - breaking for him.
One scenario could be that he's under the Cruciatus Curse. This curse inflicts intense pain, and Harry has faced it before. In a fanfic, it could be used by a new dark wizard adversary, making Harry cry out in agony.
One possible reason could be remorse. Harry might realize that he misjudged Snape all along. Snape had a complex role, and if Harry discovers the truth about Snape's true loyalties and sacrifices, it could lead to him crying out of guilt for how he treated Snape in the past.
Another possibility is that there is some sort of crossover magic. Maybe a spell goes wrong and links the NCIS world to the Harry Potter world. The NCIS agents, being the resourceful people they are, quickly adapt to the situation. They learn about the danger Harry is in, perhaps from Hermione who has some knowledge of both worlds now. Then they use their own brand of justice and skills to save Harry from whatever dark forces are after him.
Maybe Harry would be able to use the Speed Force to time - travel within the wizarding world. He could go back in time to prevent certain tragedies or gain more knowledge about magic from the past. This would add a whole new layer of complexity and adventure to the Harry Potter story.
One scenario could be that the Winchesters are trapped in a magical dimension while on a hunt. Harry Potter, with his experience in navigating strange magical places, could find a way to enter the dimension and lead them out. Another possibility is that a powerful dark wizard has set a curse on the Winchesters. Harry, being well - versed in counter - curses, would be able to break it and save them.
One possible scenario is that Harry Potter helps the giants when they are being hunted by dark wizards. He uses his invisibility cloak and other magical items to hide the giants and lead them to safety. Another scenario could be that he helps the giants who are sick. He might search for rare magical herbs to cure their diseases.
One possible scenario is that Harry Potter uses his magic to heal the Winchesters when they are injured during a hunt. Another could be that he helps them find a hidden object by using magic detection spells.
One possible scenario could be that Harry is exiled due to false accusations of dark magic. Maybe the Ministry of Magic, fearing his power after the defeat of Voldemort, spreads lies about him being a threat. Another could be that he chooses exile to protect his friends from a new, unknown danger that is targeting him specifically.
Maybe in the fanfiction, Voldemort's return in a different way causes the wizarding government to spend all its funds on defense. They might have to buy expensive magical weapons, hire an army of aurors, and build fortified defenses. This over - expenditure could lead to bankruptcy not just of the wizarding part of Britain but also have a domino effect on the non - magical part as the two economies are likely connected in some ways. Also, the fear of Voldemort could stop all trade and tourism, further worsening the situation.
Well, one possibility could be Itachi as a wizard in the Harry Potter world. Maybe he'd be in Slytherin due to his cunning nature. He could use his Sharingan abilities in a magical way, like seeing through invisibility cloaks or detecting hidden spells.