Twelve seriously wounded soldiers—Bruce operated on three of them, while the rest either died while waiting or were momentarily still alive but certain not to survive.
The IED attack primarily caused damage through shockwave effects and shrapnel. The shrapnel injuries are straightforward, but shockwave effects damage the human body by compression and dynamic pressure impacts, causing internal organ damage, fractures, and concussions, among other injuries.
Those with shrapnel injuries had a better prognosis—if they didn't die on the spot, there was a possibility of saving them. However, those with dynamic pressure injuries suffered severe damage to almost all their internal organs, essentially what is colloquially referred to as their organs being "shattered." Not only were the internal organs a problem, but the brain also suffered fatal concussions, leaving no chance for survival from such injuries.