Am Sorry to hear about your loss.
It was unfortunate that no one thought of calling emergency services during the first attack.
The second attack wasn't caused by just making him stand up and move around a bit. It was the body's self defence what made him come back to life by opening up the clogged heart blood vessels for sometime.
Whenever this happens there is always a high possibility of having another major attack if proper cardiac first aid
Things would have been different if he would have recieved immediate medical help
after first attack or first cardiac arrest
I hope this information will guide you properly. May his soul rest in peace.
Dr Bhanu partap