I wonder if they somehow were out of line-of-sight of him for a few seconds before going over to him when Bourbonnais told Assam to take a head shot to finish him off and she said “no, he looks dead already”.
But then, they would’ve heard any shots he might have fired, even if muffled by his body.
That’s what I was thinking... There was one reported account from Bourbonnais that mentioned them turning a corner and seeing him slide down and that he had started bleeding... I’d have to go back through to find the exact post. It could’ve been that he “retreated” around a corner after getting hit, and shot himself in the seconds before they turned the “corner” or something...