EE was priming fuel system on #23 bolter and requested a jump start from TR13 lube buggy. Lube buggy operator set brake and chocked the tire then reached in and flipped the engine to high idle. Lube buggy was left in gear and overcame park brake proceeded forward and pinned EE against the bolter. EE's left leg was pinned below the knee causing muscle damage. 2 EE's affected.