In fact, you should not even allow entering into a prone character's square, unless he is dying or dead.
There's an interesting flavor to it: you stand over your ally and shelter him so he has more flexibility in how he gets to his feet.I actually meant that you should not be able to end your turn in a square occupied by a prone ally. It seems I was wrong.
I still don't think there is a good reason for that rule when the ally is not helpless though. It will mostly be used for free shifts anyway, which seems unnecessary.
There's an interesting flavor to it: you stand over your ally and shelter him so he has more flexibility in how he gets to his feet.
t~
Player: Can I make an Acrobatics check to stand up in an adjacent square?
DM: Sure can. Let's call it in at Moderate DC.
Player: (rolls) Alright! I roll onto my feet and swing my weapon upwards as I go! (rolls attack)
Ah, Acrobatic Stunt, you're so awesome...![]()
Another possible fix is to allow standing into an adjacent square at the cost of provoking an OA if no ally is present to "shield" you.Only argument I believe is interesting on all this is that you can shift if there is someone in your square, but you cant if there is noone there. If you really wanna fix this we can merelly forbid "square invasion". Its way better that give free movement, or create basic combat maneuvers (partial charge) that counter encounter powers.
As aways just my 2 cents.![]()

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.