FYI: This might be lore breaking a little but please don't rub it in my face
It was the summer of Harry's 5th year at Hogwarts. He had a week before he was going back to the Dursleys. He wanted to spend that time wisely. He was visiting the Lestrange Mausoleum with Ron and Hermione. Harry knew that the dark wizard Grindelwald had a rally there with his supporters. Some were aurors is disguise. There was a battle. He came just for the fun of it.
"Hermione, what is that you're fidgeting with?" Harry asked
"Don't tell anyone, but I got myself another time turner in secret." Hermione answered.
"ANOTHER ONE?!" Ron and Harry exclaimed at the same time.
"Guys I can expla-" Hermione got cut off because her time turner started to act up.
Suddenly, the trio were standing in the Lestrange Mausoleum during Grindelwald's rally. They saw as he used protago diabolica to kill. The three watched in horror as the blue flames burned people to death.
Then, they saw somebody try to shoot a spell at Grindelwald from behind.
"That's Leta Lestrange!" Hermione whispered to Ron and Harry.
"Let me guess, you found her name in a book." Ron responded.
"Yes, and not only that and she was-"
"An ancestor to Bellatrix?" Harry interrupted.
"That's right! How did you know?" Hermione asked Harry
"I could tell by the last name." Harry answered to Hermione.
The trio overheard Leta say "I love you." To a man with goldish-brown hair (that's Newt) just before Grindelwald burned her. Just then, Grindelwald noticed the three and shot a spell at them. Harry shot one back and their spells clashed.
Hermione and Ron were startled when the spells clashed and when they did, Newt, Tina, and Jacob noticed them.
Part 2 coming soon...
(Don't put negativity in the comments.)