IMO, each person will be different. Those who have an extreme amount of adrenaline released once they know a "shooter" buck is coming in, these people may feel that rush before they shoot...others who have a slower release of adrenaline will not feel the rush until after a certain amount of time is passed....and/or they may not get their rush of adrenaline until after they release their arrow.....

i for one get the adrenaline rush as soon as i see a buck ( i am not a trophy hunter).... god I love that
feeling