Don't worry, you did your best and that is all you can do. He might not have survived if it had happened as he walked through a quiet A & E department. I have done two 50% success ratio and the success was the second. You may get lucky next time! Though joking apart I hope you don't have to again, very high stress situation.I once gave CPR to an old man who had collapsed on a pavement, he was surrounded by about 5/6 other onlookers. I kept on giving CPR until the medics arrived in an effort to save this old man, but to no avail, how I wish I could have saved his life, that was over twenty years ago, and I still think about it, so as far as I'm aware the covid jab will not kill you... so what is there to lose, nothing, but if you don't get the jab, and you catch the virus, then you may not be so lucky.
Patrick
David.