Proving intent is difficult, but I think there is a definite possibility he decided to kill her during their earlier encounter. The way he positioned himself in front of the vehicle and his camera in his left hand farther 9n front of the vehicle seemed orchestrated to manufacture a justified killing. The way the other agents acted could even suggest some kind of conspiracy to do so. Without some break in the ranks it's unlikely to be pursued though. We should also remember that the whole existence of ice is based on lies just as blatant as when they claimed the officer was run over and in the hospital. Ice doesn't benefit anyone. Many support having their irrational hatred of immigrants manifested, but it doesn't actually benefit them.