Kisanji Arael said:
That being said, I would recommend that a character may "move with" a five foot step, but doing so provokes an attack of opportunity. (snip) However, if they haphazardly throw themselves at a character who steps back to drink a potion, they're going to get themselves skewered, because there is nothing more dangerous than going at someone who just put distance between himself and you. (snip)
Yoink! As far as I'm concerned, that's the perfect approach to the 5' step.
A thought I had on the subject, also...
-----
I admit to not, myself, being a hand-to-hand combat type. Nevertheless, a lot of people are discussing the 5' step in a one-on-one combat, like a personal duel or martial arts challenge. There are very, very few D&D combats that happen that way. Spellcasters are hurling fire and lightning, archers and crossbowmen can flank by spell or mount, there are more warriors than just the two of you, and there are also horrible monsters in the countryside*. (*I know not all campaigns feature all these things.)
Gorash the hobgoblin is, along with his warband, locked in mortal combat with some adventurers. He's seen one of them has a bow, one of them's a wizard, but he's currently putting a heavy rain of blows on a human in splint and things are going well for him. Suddenly, his foe hacks at Gorash's blade to knock it aside for a moment, then shuffles backwards a few feet, shield hand dipping down. This could be because:
a) He's badly injured and stepping back to heal himself with a potion or spell.
b) The wizard has signaled him somehow and he's getting out of what's about to be a blast area.
c) He's giving the elf a clearer shot at Gorash's tender internal organs.
d) One of his allies is mounted and about to run Gorash down.
e) Something awful is charging out of the woods/cave/swamp and Gorash just became the only thing in front of it.
f) He's retreating.
g) He's trying to lure Gorash into charging after him so he can thrust that sword into Gorash's aforementioned organs.
While Gorash glances about quickly to insure he's not about to die by misadventure or surprise, the human snatches up a potion flask, pries the cork free with his teeth, and downs it in a single swallow, pressing the attack with renewed vigor. Had Gorash charged after him, there's a distinct chance the human would have put the sword in him.
-------
Sometimes "realism" means "rethinking the abstract rules".