What would have happened here if The Boss hadn't showed up?

Snake had Volgin down and Sokolov was just shot to his feet. What do you think would have happened if The Boss showed up? Would Snake have been able to just shoot and kill Volgin? He can deflect bullets in the boss fight but he looked pretty helpless here. Getting Sokolov out of there would have been hard. Maybe he could have gone to the Cure menu just like with Eva later. :D