Stark was patient, waiting for the best opertunity to take a shot. Obviously they had to be mutated from some sort of shellfish [int 10] so more than likely the shell would be hard to get through, even for energy weapons. A few shots from an ally proved his theory correct. Then she tossed a grenade. Perfect! With carefull aim he pulled the trigger an loosed a laser blast at the grenade as it was midair between the mirelurk group.