I have to agree with Sparrow, but Gruntl (and others) have the right of it too.
It really should be
a) Up to the player to state their intention to try to draw an enemy's attention
b) Up to the GM to decide how much an enemy is disposed to being influenced.
c) Sometimes a check, whether an action card or skill, to determine how effective the "taunting" is.
For example, a mindless giant slug might only attack the closest, so trying to taunt it off might not work. An evil bull might charge someone in red (like the BW) regardless of anything else. A very smart opponent might choose the most tactical enemy. Many others, however, could be influenced by intimidation, arm-waving, yelling, etc.

