This power targets each creature in a close blast 3 and marks all the targets. If the wording of the Hit line is correct, this power marks all the druid's allies within 3 squares from him and if the allies don't attack the druid, he can slide the allies 3 squares...
I think that it's not the intent of the power...
"You sound a thunderous challenge to your foes. The thunder echoes around them, causing them to reel if they don't stand and fight"
