Pushback spells don't do much damage, but are able to push back non-elite and non-boss enemies, creating a bit of distance between them and the player. There are diminishing returns on the pushback distance; after the third pushback on the same enemy, there won't be any noticable knockback anymore.
Pushback spells stun for a very short amount of time, and are able to interrupt certain enemy attacks because of that.
A green projectile that deals a bit of damage to a single enemy and pushes them back. Acts as the mage's interrupt.
A green spell that explodes at the tip of the wand, dealing a tiny bit of damage and pushing away all enemies nearby. Acts as the mage's interrupt.
Despite the spell not being a projectile, the AoE is quite large, and can knock back and interrupt enemies from some distance away.
Any Pushback shortcut can be used for the middle part of the spell.