That is how I viewed it. 1 out. However my partner was wanted to say 2 because the R3 had to run due to force and needs to advance to the next base. By not doing so, he would also be out. His only uncertainty with that play was that he was not sure if R3 had to be tagged or not.
My view is simply based on the order things happened. as you mentioned, trailing runner was out first thus removing the force.
I think we got it right by ruling 1 out.
Thanks!