Following Karen Barad’s diffractive methodology, we encounter feminist documentary cinema as a diffraction apparatus: that is, as technologies that make part of the world intelligible to another part of the world in specific ways, by means of intra-actions between human and non-human agencies and objects of observation. We propose three analytical tools: materiality, emotionality, and performativity. In this article, we analyse two Spanish documentary films that render visible the potential of feminist documentary cinema for building alliances from and against precarity: Cuidado, resbala and Yes, We Fuck! Reading the insights and patterns raised in each case study through one another (i.e., diffractively), we discuss the intra-actions by which each of these films participates in co-creating the real. We end up describing three possible effects of feminist material-discursive practices in documentary cinema.