I dive head first in a verse and swim away
And pull a pen out and throw a grenade at your brigade
Ab-Soul compares what he does in a verse, to jumping into a pool.
Diving into a pool is fast and aggressive, so when Ab-Soul starts a verse, you know it’s going to be exactly that.
When Soul says that he swims away, he just means he drifts away- he did what he had to do in the verse now he’s done.
In the second line, the pen represents a pin frmo a grenade. When the pin from a grenade is pulled out, the grenade will detonate shortly either after impact or after the set amount of time for it to detonate is up. A brigade is a major tactical military formation that is typically composed of three to six battalions plus supporting elements. The brigade would represent other rappers.
Since the pen represents the pin from a grenade (and a grenade explodes shortly after the pin is removed) then that would mean Ab-Soul and his rhymes explode when he takes out his pen. Him throwing a grenade at a brigade refers to Soulo taking shots at other rappers, as well as showing he is more powerful and that he is their biggest threat/competitor.
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