I would say pretty fast. Take a look at these screen shots of a doe taken by our very own Scott Teaschner. I find this to be very interesting and a great tool of learning.
My appolagies for the quality reduction. As you read in the story i did not want to risk any more movments. So this is cell phone video into the sun.
This is just before the sound of the bow.
This is her just as the arrow enters the screen. I know it is hard to see but it is bright orange.
One more frame we see the arrow nearing its mark. Though it looks to be low.
She crouched right into it and picked up that arrow. This is he first jump notice the blood and broadhead having exited about 8 inches or so.
These are much more clear on my ipad I wish i could save that quality.