I just started a new game and went with the two characters it decided to generate by default. No AI personality was selected for either of them. When I got to the bridge with the two guards again, I tried to recreate the same situation as before, but the end dialog was different for some reason. I'm pretty sure in the dual dialog I selected the same combination and order of charm/intimidate/reason options as before. I had Roderick choose to want to fight the guards and Scarlett chose to go peacefully. In order to try and get the same outcome, I saved before beginning the dialog with the guards. When the RPS game comes up I just pressed space to auto resolve. I had to do it three times before Roderic won the conversation and they fought the guards. At the end of the fight, Roderick this time said: "There we have it, two dead legion." When I played yesterday he said to Scarlett something like "Are you happy now, we killed these two men in cold blood" even though he was the one that started the fight. I wonder if having different character attributes caused this or saving and reloading three times.
I went on to the city, and once I got inside I had Roderick steal some nails from the table. After getting caught, the ! icon pops up over their head and when they speak, Roderick says to Scarlett "that doesn't belong to us, you know" when he was the one that stole it. You can see that in the screen shots
here.