The aim of the study was to illuminate, from video recorded sequences, interactions between individuals with dementia and aggressive behaviour and caregivers who reported problems dealing with such behaviour and caregivers who did not. Nine caregivers and two residents participated. The video recordings were later transcribed into text and analysed by using a phenomenological hermeneutic approach, inspired by Ricoeur's philosophy. The main themes that emerged from the analysis were 'Being involved and developing a positive interaction' and 'Being confined to routines and remaining in negative interaction'. The findings indicated the interactions either to be in a positive or negative spiral. Caregivers who had reported problems dealing with behavioural and psychiatric symptoms in dementia focused on accomplishing the task, where the main focus was on 'the goal itself'. In other sequences with caregivers who had been satisfied with their capability the focus was placed on 'how' the caregivers could reach their goal. Power was central in the material, in different ways, either as a possible way to handle the situation or as a possible way of defending oneself. Parts of Kitwood's framework and Fromm's theory about power 'over' and power 'to', has been used in the comprehensive understanding. Our conclusion is that caregivers should use power 'to' when they have to help persons with dementia and aggressive behaviour, as a part of behavioural and psychiatric symptoms of dementia, for being able to give help in the best possible way. They should also act in a sensitive and reflective manner, with the individual in focus.