See video uploaded here: https://www.reddit.com/r/halo/comments/ixy4y1/halo_3_still_has_serious_hit_detection_issues/
Apologies for the low frame rate video, my editing software was crashing trying to export a higher frame rate
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As you can see, I was clearly hitting both shots due to the blood decals, with even the first clip being a headshot.
I hope this is an issue with latency as I was playing on US servers from Australia, and that an update to selecting a region will solve some of these issues, but as the game should clearly have detected a hit it’s frustrating to experience shots like this even after the update, which I have already found to have made a noticeable difference to short range BR fights.