More than the heat of the flame or the roar of thunder, it was the pressure of the explosion that rocked Lex. His body shot up into the air like a bullet, spinning and flipping like a gymnast giving his best performance.
It took a few seconds before the overwhelmed and dizzy Lex found a few moments of clarity, and a few seconds more before he was able to stabilize his body. In a heartbeat, he analyzed the damage to his body, and discovered, to his great surprise, that his back was completely unharmed. There was no stab wound, and the pain had completely disappeared, as if it was only his mind.
Other than that, though, he was not in his best state. The shockwave that passed through his body had rattled Lex to his bones, and though he was largely unhurt, the blatant flaw in his array plan hurt him more.