Swim-By Attack
(Stormwrack, page 94, DnD 3.5)
[General]
You can attack in the middle of a fast pass by your opponent.
Prerequisite
Swim speed
Benefit
When swimming, you can take a move action and another standard action (such as an attack) at any point during the move. You cannot take a second move action during a round when you make a swim-by attack.
Normal
Without this feat, you take a standard action either before or after your move, but not in the middle of your move.