Argopelter won't lose aggro

Hey Guys,
When one of my buddies was killed by an Argopelter, the aggro has continued for 10+ mins so far. Is this intended? He's stuck there getting pelted with branches (it's in a tree).
Thanks
When one of my buddies was killed by an Argopelter, the aggro has continued for 10+ mins so far. Is this intended? He's stuck there getting pelted with branches (it's in a tree).
Thanks