The fear the hero strikes into the puny things that dare get in his/her way.

[Irashtar]

######
#....#
#....#
#...@.
#....#
#....#
#...U#

Okay, I'd be scared to, but which compass direction maximizes chances of living? East, right?

######
#....#
#....#
#...k.
#....#
#....#
#...@#

Ten times out of ten, annoyingly fast quarry that I tend to chase down rather than waste arrows on will trap themselves in a corner, rather than think a single step ahead, and go down the corridor. Just because they're scared of you, they still should try and live a little longer..

[Narvius]

I exploit that against Fruit Bats in ToME.
And, actually, successful TA ensures you'll survive.

[Irashtar]

Well, TA isn't a compass direction, but this still feels like a silly exploit.