If you've been practicing your AOE skills, getting out of combat becomes:
Reset Striking Dummy Enmity
Select next dummy
Reset Striking Dummy Enmity
Select next dummy
Reset Striking Dummy Enmity
This needs to be a one-click item, no matter how many dummies are angry at you.
Macro? There's a /Battletarget command that will select closest enemy with enmity, but no command to reset it.