I don't look away unless i have to get down from my tree so i can finish the deer off. I have had to do a few times over the years. I can't stand to not look, honestly. I want to make sure that deer is down and not getting up. Losing a deer from pushing it is the worst.
It sucks to see them kick around in pain if they are dying a slow death, but like others said; if that is the case the hunter needs to finish the deer off asap.