Using Earthquake (Snowcrash) + Avalanche as a Primalist or Lunge (Pilum Assault) + Javelin as a Sentinel yields two different results when it comes to being able to go into mana debt.
In the case of the Primalist, I am able to go into mana debt and still trigger Avalanche.
In the case of the Sentinel, I cannot even go into mana debt when triggering Javelin, which causes a lot of issues when trying to take advantage of Crushing Blows.