Ignoring or overruling a NavMeshAgent destination

Hi,

I was wondering if there's a way to ignore the destination on a NavMeshAgent. I have this character which, in one state, is following a target (using its position as a destination); but that in another state, is supposed to pick a random vector and move in that direction for a certain amount of time (I'm using navMeshAgent.velocity to control this).

The problem is that, if it senses the target it stores its last known position as the destination, and will not change direction after that. Does anyone know how to ignore/overrule the NavMeshAgent desitnation or a better way to assign a random direction to the agent? In any ideas would help a bunch...