Don't look in my face, I might snap, I might choke ya

from A$AP Rocky (Ft. Action Bronson, Big KRIT, Danny Brown, Joey BADA$$, Kendrick Lamar & Yelawolf) – 1 Train Lyrics on Rap Genius

Meaning

Referring back to the previous line about Post-traumatic stress disorder (PTSD), you never know what could trigger Kendrick and make him fuck you up.

Note here the change in tone that could, like this verse from Swimming Pools (Drank), signifies a change in perspective

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