My thoughts are with you. I am so sorry. You can cling to the guilt related to that half hour if you feel you must, but considering your description of the house when you arrived, it sounds like he had chosen his path when he picked up again. I know it feels like in the aftermath of an event as traumatic as this that we must DO SOMETHING, but blaming ourselves for perceived mistakes is just our need for control kicking in under circumstances in which there is nothing to do.