bomb hurdleing activists, use small but powerful explosive charges right in front of the front lines of a police line to create enough of a blast to stun them enough to leap over the front lines of police. The ability to leap over the immediate aftermath of an explosion gave them some tactical advantage but often they were beaten into submission worse then their counterparts.
Bomb hurdleing activists like to fight. They like the rush of jumping into the front lines. If you can get a group of fifty bomb hurdleing activists you can have successive explosions and leaper and the front lines just lay on the ground as the bomb mob leaps over them.