I'll pretend I didn't waste 4 hours last night making an utter fool out of myself in the deserted base and instead pretend that Mistyra is a genius that saw through my 'brilliant' idea of a trap and didn't fall for it. xD
Well, I saw how she escapes your try to grab her attempts after you win encounters and went "If I lure her upstairs where there is no meat floor there can be no escape!" it didn't work.