The RDA successfully killed the Mother Tulkun and everyone is clapping because that part of the mission is done, but Spider who thinks he's one of the Na'vi he is not too happy he looks disgusted by what just happened, you were on of the Na'vi, not a normal Na'vi one that the RDA is experimenting on you because you were different you watched what happened as well..you can see Spider not liking what he saw..He's been captured by the RDA..