So I was rewatching the Strike video and stumbled upon what I think are ammo drops. Not sure if anyone (YouTuber or otherwise) has discussed it, but I took a screenshot just in case. Take a look.
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We've seen ammo drops in the E3 gameplay last year. After Rixis is defeated you can see the metallic ammo boxes scatter on the floor. I'm guessing that they've updated the models since then though, now that we know that ammo is colour coded.