Well, sometimes he uses his titan's speed and agility to dodge the Colossal Titan's attacks and then strike at its nape. It's a classic way to take down a titan in the Attack on Titan universe.
Well, it all happened when Eren got hold of that special serum. When he used it, it activated a genetic trait within him, allowing him to transform into a Titan. It was a crucial moment in the story that changed everything for him.
The love story between them develops gradually. At first, Mikasa's love is more of a protective instinct towards Eren. As they face more and more challenges together, like battles against Titans and political unrest, their bond deepens. Eren starts to understand Mikasa's feelings more, and they share some tender moments. However, Eren's changing goals and the overall complex situation of the world they live in also put strains on their relationship. Their love story is a complex journey of growth, understanding, and sometimes, heartbreak.
The Attack on Titan manga concluded with 139 chapters. It's been a long and intense journey for fans. Each chapter added depth and complexity to the story.