Here's another example of why I have an issue with the abilities as written. Let's assume two enemies. One is 15' to the west engaged in melee with the fighter. Another is 30' to the east charging toward the Warlock. Why exactly is it again that I can't curse the target 30" away? Now change the scenario slightly. The target engaged in melee with the fighter is 40' to the west. Now, magically, I can curse the target 30' away to the east. Like I said, completely unrealistic. It might make for good balance and tactical decisions in a miniatures game, but is fails the test of versimilitude. Like I said, if the concern was game balance, they could have just given the ability a max range. Or how about this, give a -2 penalty to defense against other opponents, the cost of focusing your attention so myopically on the other target. Either of those options make sense and preserve game balance.