Maybe he uses some powerful magic spell he learned at Hogwarts. For example, a protective charm that shields Harry from a deadly curse.
It could be that Albus Severus Potter travels back in time within the fanfic's plot. By changing certain events in the past, he indirectly saves Harry's life. He might prevent a dangerous encounter that Harry was supposed to have, thus altering the course of events in a way that Harry's life is no longer in danger.
In the fanfic, Albus Severus Potter might discover a hidden prophecy about Harry's life being in danger. Using his wits and the knowledge he has of the wizarding world, he figures out a way to counter the threat. He could gather allies, like some of his friends from Hogwarts or other powerful wizards, and together they come up with a plan to save Harry. He might also use some unique magical artifacts or potions that are only available in the fanfic's fictional world to rescue Harry from the brink of death.
The best chapter pointer here is Chapter 88, "I Call This a Test of Your Will!". It opens with She wanted to refuse, but didn't have the courage to do so. and closes on Let's go," Jiang Li said in a soft voice..
Look to Chapter 45 for the clearest answer. It begins with Helplessly, Jiang Yan had no choice but to step on the accelerator., keeps building through As Jiang Li had said, this stretch of road was indeed difficult to..., and lands on The guests have to go through so many troubles on the way.
Look to Chapter 83 for the clearest answer. It begins with When they received the task, the three of them were already sharpening..., keeps building through He Yun had originally wanted to try making braised fish under Jiang Li's..., and lands on Since all the guests were staying at Uncle Zhao's.
If you want the clearest chapter reference, go to Chapter 58. Early on, Facing Jiang Yan's triple barrage of questions, Jiang Li's only response...; later, the chapter leans on After a long while, she yawned indifferently and said, "I didn't pick up....
If you want the clearest chapter reference, go to Chapter 63. Early on, During those seven days, he thought he had completely escaped from that...; later, the chapter leans on But now it seemed he hadn't..
Look to Chapter 49 for the clearest answer. It begins with My phone!!!" Jiang Yan's roar echoed continuously through the mountains in..., keeps building through Watching helplessly as his latest-model phone was taken away by a..., and lands on Thinking this, Jiang Yan marched forward, pulled Jiang.
If you want the clearest chapter reference, go to Chapter 74. Early on, Having seen Jiang Li's ID before, he knew that this person named Shiguang...; later, the chapter leans on And he only knew the answer to that one question..
A practical answer is Chapter 49, because it turns the idea into a concrete scene. The chapter opens with My phone!!!" Jiang Yan's roar echoed continuously through the mountains in..., adds pressure through The guest with the highest score will receive a series of resources from..., and ends on.
Chapter 81 is the strongest chapter-level answer because it starts from Qi Tianyu, who chose curry beef rice, received a piece of curry and a... and follows through on The summer on the Southwest Plateau is no joke; the sun at three o'clock....
Chapter 22 is the strongest chapter-level answer because it starts from Hearing this, Su Yinwan looked at Shang Shaojing with a face full of... and follows through on Jiang Li's righteousness temporarily shut Jiang Yan up, but after a few....