I am beginning to notice a pattern. When my husband walks Finn, she won't do her business for him. She barks to let us know she needs to go out at night, and when he takes her, it's playtime. It's outdoor tug-o-war, it's jumping around, it's madness and chaos. When I take her, it's strictly business. We walk to our location and she does what she has to do and then we come back. There's some jumping and playing on the way back, it's not at the same level as with my husband.
* Disclaimer - when my husband walks Finn in the morning or during the day, she has no problem doing her business. This is strictly a nighttime ritual.