I used Fire Spray on the assassin standing behind me, but Jim's still facing away from the guy...so vulnerable.
Do you have screenshots/battle log? Those are very helpful for understanding what happened in your battle so we can check if there is or isn't a bug—and if there is, identify it and fix it.
Er...I'll have to look into that. I guess I can try to recreate the situation for a screenshot, but with the random deal of cards, who knows when Fire Spray will come up. And I'll look for the battle log stuff.