Gamora takes this all in with open suspicion. She knows better than anyone how her 'father' gets to people. She wouldn't be surprised if he outsourced the problem of the Guardians to one of his little pawns. The fact that she knows Terra was a target of invasion, but not the full results doesn't help. She can't know how many of them he turned.

As a result, Gamora doesn't have to play tough. She looks around the area and at both Steve and Tony. The look she gives them both is withering. "Allow me to get to the point. If this is a trap, you had better spring it now if you want a prayer of surviving our wrath. I promise the rest of our team will not hesitate to crush any ally of Thanos where they stand."