Getting a high femoral/inguinal hit is pretty much difficult to stop, period. A TQ won't go there, and if you're trying to apply your own pressure, you'll probably not succeed.

I have a TQ in my range bag after my buddy nearly shot his leg doing holster draws (PSA: if you own a SIG, de-cock it before re-holstering).

CPR success rates of 30% are, IIRC, in-hospital only. Closer to 5-10% traditionally in the street. Highly dependent on time to CPR and first shock. Some of the "push only" CPR rates look better, but time will tell.

Beginner first aid:
Air goes in and out, blood goes round and round. Change either and you're in trouble.