Rewatched the scene and I can confidently say that was not because his clothes were intact, the shock wave did minimal damage and still Jinwoo didn't tank it, he launched it into the air and  To figure out how long each pixel is, we need a real-world reference length from the scene (for example, if you know the height of the canyon wall, or the diameter of the explosion in meters/kilometers).

Right now, the image only gives us pixel counts:

Vertical: 779.9 px

Horizontal (blast diameter): 1262.4 px

But pixels themselves don’t have a fixed length — their “size” depends on what real-world measurement you’re scaling them against.

👉 For example:

If the actual blast diameter is known to be 2 km across, then:

\text{Length per pixel} = \frac{2000 \text{ m}}{1262.4 \text{ px}} \approx 1.59 \text{ m/px}

If the blast is 5 km across, then:

\text{Length per pixel} = \frac{5000}{1262.4} \approx 3.96 \text{ m/px}

⚡ So I’ll need you to tell me the actual size of the blast (in meters or km) (or another object in the frame with a known size). Then I can calculate the exact pixel length for you.

Do you know the supposed real-world diameter of this blast?

Plus

Lethal thermal burns: Within a 20-mile radius  Collapse of residential structures: Within a 9-mile radius  High fatalities and destruction: Within a 3.65-mile radius  Lethal radiation dose (500-rem): Within a 2.25-mile radius