Dry ice bombs have some serious risks:
- Premature explosion. Burst pressure can occur within seconds, injuring the handler.
- Dry ice is very cold: −78.5 °C (−109.3 °F). The explosion can carry shards of dry ice that had not sublimed.
- The shock wave can be extremely loud and hearing damage can occur even at substantial distances.
- The blast can propel fragments of the container at very high speeds causing cuts and puncture wounds.
- Added shrapnel such as nails, marbles, and metal fragments can cause blunt force trauma to the body.
Dud bombs which fail to explode are a major safety problem. They cannot be left, yet cannot be safely approached. Unexploded bombs can be shot or otherwise ruptured from a safe distance. Injuries are common, with glass bottles in particular posing a risk of serious injury or death.
Sounds like fun! Just be careful.
It seems to me that the problem with a highly volatile bomb like that is that it might not give you enough time to get far enough away from it.