If you have ever been to a military medical facility, you would know people are packed in pretty tight. Usually rows of chairs faceing the same direction several rows deep. In that close of a group it would be easy for a round to pass through several people.
I’ve spent what seems like YEARS waiting in line at Army hospitals for various tests and innoculations.
Still, one round hitting multiple targets is rare.
Sure, they were all lined up, but we just don’t know yet.