Barbarian : limitation needed against Knockback rage power

[Malevol]

AMong "rage powers" is the "Knockback" (even in alpha 3) "Anyone hit by the barbarian’s melee attacks this round is pushed back 5 feet, if possible. This power is used as a swift action before any attacks are made. (4 rage points)".
I feel like it goes against a general rule that no power should affect an opponent regardless of his abilities : then I suggest that the opponent got a saving throw, or that the ability be converted to something similar to an "improved bull rush" feat, or that it gives an additional bonus to bull rush.

[Squirrelloid]

Malevol wrote:

AMong "rage powers" is the "Knockback" (even in alpha 3) "Anyone hit by the barbarian’s melee attacks this round is pushed back 5 feet, if possible. This power is used as a swift action before any attacks are made. (4 rage points)".

I feel like it goes against a general rule that no power should affect an opponent regardless of his abilities : then I suggest that the opponent got a saving throw, or that the ability be converted to something similar to an "improved bull rush" feat, or that it gives an additional bonus to bull rush.

So you're opposed to touch attacks? Because, generally speaking, those always hit.

Also, the barbarian has to hit them, meaning its effect does depend on their AC, which last I checked is an opponent's 'ability'.