Decisive and direct in thought and deed, this brutally ruthless decision was the only chance at victory under such conditions. Execution was swift, but the [Divine Will]'s speed in crystallizing Campbell was faster than Iris's calculations and Campbell's determination.
In a fraction of the time it takes to blink, Campbell had transformed into a sculpture of black diamond. The Heaven Crystal, the embodiment of the flash-bomb, the orange floral wreath around his wrist, and the courage, thoughts, memories, and vows they held, had all been corroded by the chillingly cold reflection in the black crystals. They then withered and shattered.
If the explosion had been successful, it might not have injured Li Lin. However, it would have disrupted the rhythm of attack and defence, creating an opportunity for Rinaldo and giving Campbell's death meaning.
A thinking process that verges on heartlessness, but under those circumstances, there was no choice but to make that decision.