In the age of Anthropocene, we problematize the multitudes of affordances of humanism that we are ultimately entwined by and within. Education is a discipline that always placed predominance to the human centredness ignoring several non-human and non-living objects that also form a part of teaching and learning. However, the humanistic notions of hierarchies have undergone radical changes. The locus in a classroom is no longer regulated by teachers and in a multicultural, multilingual classroom, the interaction between teacher, learners, materials and methods are evolving continually redefining the power relations. This essay highlights how every assemblage (an assemblage being a random clubbing of several human and non-human elements) is unique and in a state of flux to act and react with various human and non-human elements within/outside classroom territories. Designed as an autoethnographic study, by analysing the major tenets of posthumanism and by connecting them with English language education, this article argues for a posthuman turn in English language teaching and learning by examining the research diary entries of the author to identify how the entanglement of affect, rhizome and assemblage results in deterritorialization. Episodes and anecdotes from an ESOL (English for Speakers of Other Languages) teaching context in England serve as primary data. This autoethnographic study reveals the agential assemblages in the classrooms which problematize the singular agency of the teacher as the reservoir of knowledge and discusses how the power structure in the classroom is altered when learners and their affective assemblages influence the teacher and the very practice of teaching.