There are some variables in the string jump theory the main one being the attitude of the deer at the loose a deer that's locked up and alert versuses one that is relaxed a deers reflexes are probably 10 times faster than a mans I've seen deer drop straight down but a lot of times it's more of a tip over than a drop and they seem to be able to do it plenty quick as tonto would say at any rate it never hurts to aim just a little low just in case all the best.