Mac and the gang are out at a bar drinking - maybe celebrating something, maybe just hanging out, whatever (would probably take place post Jack leaving).
Mac ends up being the last one there. Maybe Bozer and Leanna took off together, Desi's still doing her loner thing, Riley... left for reasons...
Anyway... Mac ends up roofied but Murdoc ends up saving him and actually doing nothing, just returning him.
Although he possible returns to kill the guy

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