You're right, along with the enemy at L10, the enemy at L8 is also under the effects of Daunt.  And yes, allies can freely move through each other.<br/><br/>Edit:  I think I'll go ahead and finish the enemy at L8.  Claire can then move up and attack the mercenary, or take L8 and then attack.  As long as the mercenary is then finished off by Valerie or Seth, this should create a chokepoint that the enemy cannot pass due to Claire's ability.  Does that sound alright?