John now stood 1000 feet tall, his massive frame casting shadows over buildings and streets. The city buzzed with panic and chaos, people scattering like ants beneath him. "I didn't mean for this to happen!" John's voice boomed, filled with regret and confusion. Liam, standing at the edge of the school roof to meet his friend's gaze, felt the weight of the world on his shoulders. "We need to fix this, John. Together."

As Liam delved into old books and forgotten legends, he discovered a prophecy about a giant who would bring balance to a world teetering on the edge of chaos. Realization dawned upon him as he deciphered the arcane text. "This isn't just a mistake, John. It's destiny," Liam murmured to himself, the pieces of the puzzle finally aligning.

Liam confronted John, who stood at the city's edge, conflicted and isolated. "We need to mend our friendship first, John. That rift between us is what started all this," Liam called out, his voice echoing with sincerity. John looked down, his expression one of vulnerability and hope. "I'm sorry, Liam. I was wrong to doubt you," John confessed, a single tear the size of a lake falling to the ground below.

Through the power of friendship and the knowledge they uncovered, Liam and John found a way to reverse the transformation. The city breathed a collective sigh of relief as John returned to his normal size, their bond stronger than ever. As they stood together, the sun casting a warm glow over their faces, Liam grinned and said, "Maybe next time we stick to safer experiments, huh?" John laughed, the sound full of life and promise. "Agreed. But what an adventure it was!"