The song "Last Breath" by Helmet is open to interpretation, but based on the provided lyrics, it seems to convey themes of tension, power dynamics, and betrayal. The lyrics suggest that the person being addressed is feeling highly agitated or tortured, and this torment is somehow benefiting the person speaking. The line "Who's keeping score now?" implies that the speaker is gaining an advantage over the other person. However, in the past, the person being addressed had given the speaker some indication of their limits or boundaries ("You let me know before"). The speaker then expresses uncertainty about how far the other person can go or achieve, and they can only guess as to what their capabilities might be. It seems that the speaker believes that the other person would not even notice when everything around them starts to disappear or fade away. The phrase "Your last breath on earth is all I can take" suggests a sinister intent or desire for the other person's demise. It could be interpreted as either a metaphorical threat or a literal wish for their last breath. The following lines introduce the concept of compliments, questioning whether they are sincere or manipulative ("Are you for now or against?"). The speaker perceives the other person to be excessively nice, which somehow raises suspicion or distrust. The line "You'd murder me right now" further emphasizes the potential treachery or betrayal. The repeating line "Your last breath on Earth is all I can take" reinforces the idea that the speaker desires some sort of harm or negative outcome for the other person. Overall, the song appears to explore themes of power, deception, and a reversal of roles within a relationship, leaving the exact narrative and meaning open to interpretation by individual listeners.