Quoted from Bigbad:If your playing martell and tyrell as stark....will hitting the button complete both modes?
No. It only does one. It ends the house that is on top when you SELECT the two houses (which is the house which is on the left when you are PLAYING the mode). When you are Stark and you are picking the modes to play, you can toggle them so that the house you plan to end with the Dire Wolf is on top when you are selecting the houses.