Yay...
Btw, the answer to my question:
Originally posted by Sage Tessa
Why does Viper have a vendetta against Sage?
Why should she have one with Storm?
Behind them Viper walks up with some medical personnel following her. She asks them if she has come at a bad time, but then them that she had heard that they needed assistance and as ruling prince of Madripoor she decided to come herself to personally to the X-Men’s needs. Viper remarks on her pity for Gambit and also for Rogue, who she seen on television fighting Vargas, apparently is not much better shape than the cajun X-Man. Viper walks up to Lifeguard and comments on how remarkable she looks now. Viper turns her attention to Storm and jokingly tells her that Storm is not the tallest X-Man anymore. Storm secretly takes Sage’s gun from her side and aims it at Viper asking her if she is wearing Kevlar ? Not even awaiting a response, she surprisingly fires the gun and it hit Viper dead on, knocking her to the ground. Bishop runs to Storm and takes the gun from her hands, rebuking Storm for her actions, though she explains that the Viper nearly killed her. Sage drops on top of Viper, pinning her left hand with her knee, and the right hand with her other foot. She places her blade to Vipers cheek and tells her that the X-Men are family and if she ever attacks them again, herself or through surrogates, Sage will hunt her down and kill her. While a trickle of blood running down her cheek, the Viper agrees to Sage’s demands.
So, in Uncanny #448, when Viper attacks "Sage," she has, in her mind, a pretty good reason...