Projectiles can be seen in unexpected places. They appear when Guardian uses hands to climb to cliff, they can appear when using ghost, they can appear for a while in the air. In all cases it appears on screen, not in the game world, i. e. it is not a real projectile, just its model.
For first 2 points, watch attached video. For the last point, you can see it [url=https://youtu.be/zxB3jj7-aRQ?t=1274]here[/url] (right side), [url=https://youtu.be/zxB3jj7-aRQ?t=1511]here[/url] and [url=https://imgur.com/6522VBW]here[/url].
This ball is definitely a model of Whitherhoard projectile, [url=https://imgur.com/a70JSht]look at its projectile[/url] while holding Witherhoard and being invisible.
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Ive seen this too, and my theory is that while Witherhoard is holstered on your back (when you’re holding a heavy weapon or ghost), the model of the grenade in Witherhoard’s magazine goes through you and interferes with your perspective, but its just a visual glitch, so not much to worry about