TexasCHLforum.com

If the Occupy loser...I mean protester opened the door with occupants inside as the article states, then the Castle Doctrine would apply maybe. The Castle Doctrine states...(A) unlawfully and with force entered, or was attempting to enter unlawfully and with force, the actor’s occupied habitation, vehicle, or place of business or employment;

HOWEVER, it also states...(2) did not provoke the person against whom the force was used;..., so since they were on the loudspeaker of the truck yelling at the protesters, then they were provoking them. So, the police may decide that one cancels out the other, and then decide to cite the person in the truck and let the DA or Judge figure it out.