Quake Combat+ is a refinement & continuation of Quake, SMC & Quake 1.5, built on Darkplaces, aiming to provide the ultimate Quake singleplayer combat experience and perfect the existing works without straying far from the original design/balance to retain compatibility with the many great custom-made user maps out there.
Improved Yakman projectile attack. Visuals improved + wider spread so it is harder to dodge and can't be abused with elevation differences in the same way shambler lightning can + sets you on fire on nightmare difficulty + better sound design + slightly faster projectile speed based on skill level + chance to refire (fire twice) on nightmare like most of the other enemies do.
Yakman have various other improvements, this details the one projectile attack only.