Arterial blood is bright red (loaded with oxygen). If they got shot in the leg and there's bright red blood, likely a femoral artery. Going to need a tourniquet. I see they got a guy doing makeshift tourniquets in the pic. Did they drag these people off the subway car? Did they get shot where they stand/lay? Where's the trail of blood? Blood on their shoes? Going to be a lot of blood if it's arterial.