Battle Rap veteran Okwerdz has a web series titled Freestyle Vault where he invites MCs into the studio to rhyme, off the top, with him. For episode 15, he hosts one of the best freestylers in the game–King Los. The pair trade impromptu rhymes for the better part of 19 minutes, but, after a certain point, Los takes over.

As you might expect, with 19 minutes of freestyling, the quality of the rhymes vary, but there are some true bursts of inspiration. At the 2:45 mark, during a particularly animated moment, Los accidentally breaks the camera being used to film the session…and rhymes about the incident real-time. Later, at the 12:15 point, Los catches the flow and goes off for nearly four minutes straight. For true fans of the sport of rhyming, all nineteen minutes are worthwhile. Check out the video.

Related: King Los Goes To TOWN, Freestyling Over Alchemist Beats For 15 Minutes (Video)