Boulder Bash's projectile falls from the sky, so it can't be blocked too easily.
Small Fireball is a projectile that is shoot forwards in a straight line, so its path can be blocked by enemies, high terrain, barrels...
Later you'll find spells that launch multiple projectiles in arcs which are even trickier to avoid blocked paths.
Last edited by Vaxsan; 07/01/15 07:08 PM.
