A lot of great examples of reaction time in this but the one at about the 6:00 mark is completely amazing. Next time a deer ducks your arrow keep this in mind. If we (humans) are capable of this then a deer can certainly get out of the way of an arrow in the 1/3 of a second it takes to get there. Example: 75ft (25yds) @ 270ft/sec = 0.27 seconds.