Actually M950A is angry that Thunder cheated on her with Scarecrow and had a daughter, SAF, which a guilty Thunder tries to hang herself.
This is based on a joke by the fandom that SAF is Thunder and Scarecrow's daughter, like how they joked PA-15 is M950A and Thunder's daughter.
Wait, wasn't the opposite?: SAF looks more like a Calico and Scarecrow's daughter rather than Thunder and SC's. The 'cat ears' thingy and the shades of aqua-color hair gives a 'M950A vibe'. I genuinely thought Thunder was about to hang, or at least tie, the randy beast that Calico must be.