Let's not forget, apart from distance, the fireball is expanding in all directions. At 1" from the center, you're exposed to half the fireball. At 1 mile from the center, you're exposed to a tiny spherical arc of the fireball.
The energy is going in every direction, not just at you. With distance, you will receive a smaller portion of whatever energy made it 7 miles out.
The energy is going in every direction, not just at you. With distance, you will receive a smaller portion of whatever energy made it 7 miles out.