Explosions can hurt (duh). They will almost certainly cause burns, which are some of the most painful wounds you can get. And so I agree entirely with the advice from childhood buddy 2cents (emailing from a secure, undisclosed explosives bunker somewhere south of 45° North):
Only a fool shoots off incendiary devices sober! What if you blow off a finger or something? Sober that would hurt.Sure would. I recommend drinking heavily. These guys sure have been.
Yikes. From the looks of things, they won't feel the burn until they sober up.