Says the guy whose partisan blinders are on so tight that he is now calling Reason magazine far left.

While the message is terribly incoherent, the question clears up the fact that he is not championing Ortega's actions and wonders what would drive a guy to do something like that. I feel more sorry for this guy who is getting slandered as a would-be assassin's supporter than I do for Rick Perry not being able to keep his own talking points in check.
You do see that, short of replaying the video clip multiple times, and even after, it is difficult to discern what this guy is calling his "moment of silence" for.
He clearly says
"a moment of silence in solidarity for the person they said was from the Washington, D.C. Occupy. Maybe, why did he feel the need to shoot the White House window today? So I think we should have a moment in solidarity for the White House, and for the guy that shot at the White House today".
But it is still a vague message, they still voice solidarity with the guy, and every last OWS person bows their head, no one objects to what is said.
Only after repeated plays of the video does it become clearer (maybe) that they are bowing in silence (maybe) for his tormented soul, that would motivate him to shoot at the White House.
They are all bowing "in solidarity".
Precisely what that "solidarity" is for is open to interpretation.
Given some additional complexity by the next comment that immediately follows the silence: "Occupy the Police Department." Ohh, I'm quite sure that was meant in the most pacifist and non-violent way.