We have all had our share of giving in one form or another I suppose. This science teacher was one of those folks all liked. Super nice guy.
I mention these incidents from my life for others knowledge and encouragement. Don't have a tourniquet use pressure point. Great hurt seriously,(my case shot) or heart attack, (from experience), don't go into shock. Stay calm and breath. Most who've experienced these kinds of things just don't talk about it. I understand that also and respect it.
Taking your shirt off and using it works well to.
During a mountain bike race a rider took a bad spill, and sliced his arm open badly. I took my shirt off and used it, and we got him to medical care without bleeding out.
Not sterile, but nobody is going to care about a little infection, over death.