It is trigger-happy because there was no good reason to draw the weapon or shoot at all. Shooting the woman did not do anything to stop the car, to the contrary it resulted in the car accelerating and hitting another vehicle.

He could have stepped aside instead of drawing his weapon and there wouldn't have been any issue. He also shouldn't have walked around the car that way, that was entirely unnecessary and dangerous.

The woman is clearly distracted by the other ICE officer, that's just an all around dangerous situation they created entirely unnecessarily.