All skills with CD less than 4 sec shouldn't proc aftershock as i think.
At least when without -BO mode.
Skills with CD 4 sec or higher only able to proc Aftershock.
Such skills as:
- Viscous Nasal Goo
- Quill Spray
- Arcane Bolt (level 3 & 4)
- Mystic Flare (aghanim ver lvl 3)
- Life Drain (agha ver)
- Blink Strike (Riki ult)
- Rearm (lvl 3)
Should not proc Aftershock in my opinion. At least when not in -BO