The element of transformation present in Thetis can be understood in many different ways. It especially becomes pronounced in the last stanza, which ambiguously discusses Thetis’ transformation into a mother. A possible interpretation is that perhaps, the transformation that seems the least liberating – motherhood – is actually the most liberating one. Thetis’ acceptance of motherhood may be her changing the definition of liberation itself, succumbing herself to a new identity. Some view that motherhood is actually forced upon her, extending her entrapment. Regardless, Duffy reveals a power dynamic between Thetis and the pursuer. Despite her efforts to evade through various forms of transformation, Thetis is always caught by the pursuer who adapts. The male partner is always in control of the woman, no matter the attempts of escape. Perhaps, Duffy is presenting a resigned view that the changes we make as an individual only prolong our fights and some power dynamics cannot be changed, only accepted.