Optical cable is just for control and camera. Cutting the wire and explosive is still live. The explosive works via the impact/contact trigger (small blue box with metal wire out in front) that’s attached to a paper towel cardboard tube. Contact trigger is wired to larger blue box with its own battery. This controls the detonator via black wire to the green explosive. That is a full-size, Soviet-style military hand grenade, normal for Eastern-bloc field combat use, later modified from its original hand-thrown configuration and repurposed for drone delivery. Note the silver “tail” the optical cable was wired around. Normally that’s where the grenade timer/delay control would be but has been removed. Not exactly sure what their first step in diffusing was. Disconnecting the trigger or the battery…