“It’s pointless to drop the and mag and hold it in one hand while retaining the pistol in the other.”
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Actually this livestream lends credence to the guess that what he held in his left hand was his cellphone which was live-streaming. And also lends credence to what was dropped (when he attempted to shoot Kyle in the head) was the cellphone as it continued to livestream. The “something dropped” was seen in other video of the incident.
Yes agreed. If you look at the GIF posted #31 it sure looks like the phone he dropped in the video linked at the source.