[RSM]

A former ATF agent said earlier if you look at the policeman in red, he is standing on the gun to preserve the evidence. At one point he moves but left foot stays in place like it’s in concrete. Later when police tape is put up, you can see the gun.

[Carl Vehse]

Here are snapshots from the video of frames at 1:41 (left) and 1:42 (right).

[SwampFoxSC]

A former ATF agent said earlier if you look at the policeman in red, he is standing on the gun to preserve the evidence. At one point he moves but left foot stays in place like it’s in concrete. Later when police tape is put up, you can see the gun.

I think that's right.