Screw throwing it. Ground bridge him straight to the top of the volcano? And even if the ground bridge only allows your current location to base, then at least ground bridge him to base then straight back to the top of the volcano? I mean, what's one second or two worth of toxin in the base gonna do while they recalibrate the coordinates to the volcano's peak? Can't be THAT much damage if BH is able to walk that much distance with it.