Most of the incident was captured on video from multiple angles. Rather than argue that he didn't do it, Huston's defense is arguing that he had the right to drive through the protestors because his traffic light was green.
In the videos shown in court, many of which haven't been seen before, Huston's truck appears to approach a car at the light. When the light turned green, the truck is seen swerving around the car and comes up to the protestors who are crossing, before stopping when it collided with a pedestrian.
It's truly amazing what motorists think they can get away with.
There's a part I looked up that he's probably using as his defense and it's something like "Pedestrians get right of way as long as they are making due effort to exit the intersection". Which, okay, that's obviously anti protest but say he has a point and it's valid.
It still doesn't say that he should ram into them with his truck. No where does it say "If a pedestrian is idling in the street you are free and clear to mow them down with your oversized tiny man machine"