He left the gun behind on the rooftop. Quite a bit of kit for a 22 year old, seems to me he was likely helped.
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I’m curious if that’s the dude in OCP’s setup? I say that because I saw a brief video clip of a local LEO in OCP hopping out of his SUV cruiser, donning an Eberlestock G2 Gunslinger-type bag, and jogging off towards a building.