Get a copy of Lund's The Coming Of The Lord. It is the best book on catastrophic last days events out there. It goes into pretty good detail on the topic.
I spent five years making far more then normal visits with one of my best friends as he died. His wife told me as I was leaving one of those visits that he really enjoyed when I would come by and talk.
He volunteered, let him do it. I offer to help people all the time, whether or not I HT them. I would wonder how I had ticked off my HT family if I offered to do something for them and they declined.