User blog comment:Bobdave/Scyther vs Sneasel. Rap Battles of the Pokédex Season 1/@comment-25012248-20150521205608/@comment-28938497-20150521210037

The term you're looking for is "sibilance." It's a form of alliteration that binds the sentence together more lightly and gives a smoother albeit less aggressive sounding line.

Student of flow, you have leaned much, but you have much still to learn >:3