Can I help a friend with missions if they have a different mentor? After unlocking the Watchtower and the ability to travel between cities, I assume I can visit my friend who is allied with Superman, while I am allied with Batman. Can I help my friend with missions in his city, and vice versa?
And by "help" I mean accept the mission, see the objectives, get the rewards, etc. Not just run around blindly attacking people while he chases objective markers and gets all the goodies.
Other than being in the same city from the start, is there any pro/con to having the same mentor as a friend?