Why did it take 2 days to retrieve the body of Gazan 'killed' by IDF sniper?

Last month we published a post based on Thomas Wictor’s fisking of a International Solidarity Movement (ISM) video purporting to show the ‘killing’, by an unseen IDF sniper, of Salem Khalil Salem Shemaly in the Gaza City neighborhood of Shejaiya (on Sunday, July 20th) as he was looking for missing relatives.  
Despite the inconsistencies and seeming fabrications in the the highly edited ISM video, the story was reported throughout the mainstream media – at the New York TimesNewsweek, Times of London, Daily Mail, Vice News and elsewhere
Today, shortly after we cross-posted Wictor’s latest post on the ‘killing’of Shemaly (which fisked a Channel 4 News report on the ISM video), we noticed that, per the list of Gaza war casualties, Shemaly’s ‘dead’ body was retrieved two full days after the videotaped ‘killing’:

Salem Khalil Salem Shemaly, 22, Sheja’eyya – Gaza (Killed Sunday, Body Located Tuesday)

Why would it take two days to retrieve Shemaly?
Are we to believe that the Palestinian rescuers (in the yellow vests) and the ISM activists filming the incident were all afraid to retrieve Shemaly out of concern for their own lives?
If so, how can this concern be reconciled with the fact that they were extremely close Shemaly at the time of the alleged shooting, and yet weren’t touched by the ‘IDF sniper’?

still shot
Palestinian rescuers observe Shemaly’s ‘death’

Here’s a close up of the ISM crew filming Shemaly’s ‘death’.  
Capture
Are we to believe that, shortly after the moment captured in this frame, the ISM activists and Palestinian rescuers decided against retrieving the body, turned around and simply fled the scene?
Why won’t ISM publicly release the full unedited video, so that these questions – and those posed by Thomas Wictor – can be answered?

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