ANSWER:

Prophet salla Allahu alaihi wa sallam could see behind him in that particular event while praying. 

Kindly refer to the following link(s):

The belief that he had no shadow is baseless and not authentic. 

 

Sheikh some people says that Mohammad saw was also able to see behind him and he had no shadow .. is it true ?

Biography of the Prophet salla Allahu alahi wa sallam | January 22, 2018 1:00 am
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We believe that kissing and prostating to a grave is not allowed in Islam. But what about when Bibi Fatima A.S kissed and prostated to her father’s grave at the time when a burning door fell upon her breaking her ribs? Why did she do it?