Best to ascend straight up. They can't follow.The lighting and focus would certainly make one wonder. But if it Is PS it is very well done indeed.
Redtails are the most numerous large aerial predators out here on the High Plains. They grow quite large, and some folks mistake them for eagles. For aggression and success they give nothing up to the eagles who share their range. I guess the best 'Plan A' if you meet one in the air is to make like you're attacking him, as turning and running will probably be more than he can resist. His prey-drive will kick in and if you're lucky you'll be off to the repair shop. Otherwise, it's probably going to be a burial detail.