True, I never even think about calling to them. That is probably the worst thing you can do, due to the possibility of educating the deer. Instead when I get busted, I stop and stand still as a tree and dont move whatsoever till I know for sure the deer is long gone, or for at least five minutes. this is because probably 90% of the deer you bump dont know what you truelly are, they may have heard a noise, or just caught a wiff or slight movement they didnt like, and with deer being as skittish as they are, the smart ones run first and think later. I dont know how many deer I have observed that blow and run a little ways due to another deer making an unexpected motion or noise, its very peculiar how they act. Also I stand and wait so long because too many times to count I have busted a deer, got frustrated and just continue walking and bust more deer that were never alarmed by the other deer right in the same spot. This scenario too I have observed, which one or two deer will bust and run off, yet another deer or multiple deer will pay no attention, and just continue on with their activities. Basically busting deer is just a bad move in a big ol' chess game, and you got to strategize and figure out the best move for countering this fault.
"Look what venison does to a goofy guitar player from Detroit? I'm going to be 54 this year and if I had any more energy I'd scare you."
- Ted Nugent