Someone begs their 'big bro' to heal them completely, but the big bro refuses and offers only to spare their life.
The words appear when the audience laughs.
絶対に許さねえからな!
I'm never forgiving you for this!
Textbook絶対に許しませんからね。Plain negative "許さない" becomes "許さねえ": the "-ai" sound shifts to "-ee", giving a rough, angry, masculine tone.
Tone: RoughSpeed: fast
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