Playing necromancer minion build, specced into zombie vomit to give armor shred, had a few points left so specced into leap, suddenly my dps decreases and it turns out that the zombies stopped vomiting on anything when they leap. The moment i spec out of leap they vomit again and my clear speed raised immensely.
Either the zombie leap attack node should include a caveat that it disables vomit, or the interaction is unintended and may need to be looked at.