mardaddy |
...who is in their threatened square.
Specifically - PC front surrounded by sz small enemies, wants to attack with whip (or any other Reach weapon) BBEG in back of small enemies.
I would think this would be treated like using a missile weapon (provokes attack of opportunity from the Small enemies?) but not sure RAW, it is a melee weapon after all.
Thinking also to judge it as small creatures in front get a situational +2 to hit next round because the PC is not actively trying to engage or defend against them, but that would be more house-rule.