Emergency Garage First Aid! Sort of!
Did almost the same thing a long time ago. Cutting off a 1/4 panel and rear section from a car, I was holding one side, another guy was holding the other, third guy operating the torch. As he finishes cutting through, second guy decides to let his end go, I end up with a 5 inch slash across the forearm, just ahead of the elbow. We got little to no first aid supplies, I run some cold water over it for a few minutes, get the bleeding under control, then wrap some paper towel around it, along with some masking tape. Good to go! Finished work, and went to the bar, as usual. No visible scar some 35 years later.