Reaction time is only part of the picture. First you recognize the issue. Then you have to move your body. In court they generally use 1.5 seconds for all of this. Your best case is .7 seconds, but this situation was clearly not the best case - even if the human had been paying attention it would be much worse.

http://www.visualexpert.com/Resources/reactiontime.html has a good discussion (starting with why 1.5 seconds is not the answer)