Oh, there goes the bell, the sound of the opening ding
The opening “ding” is the bell which starts the fight in a boxing match(in this case Eminem’s assault). Here Eminem is clearly saying he’s only just begun, ignoring his previous lines.
Notice how at this moment he turns up the flow and metaphors. Also the way he says “Oh” in a surprised manner further shows his opening lines were just him playing and now he’s ready to “start” his verse
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