Ryujin
Legend
Is it really not stated anywhere directly that you can attack an adjacent foe with a ranged attack?
It certainly is implied:
Actually what you quoted shows that it CAN be done. If you couldn't, then there would be no need to state that it invokes an attack of opportunity.
This can be a pretty good schtick. Your defenders mark a target then you walk right up to it, and do a ranged attack from an adjacent square. at that point your target has to determine if taking a free basic attack against you is worth getting one or two in return from your defenders.