Too early to tell. Depends entirely on the substence of the 'bullets'.
If the bullets themselves are just charges of aether without a solid object to be propelled, than it can be defended in most ways a spell can.
But remember we're a Japanese RPG, so parrying bullets is quite feasible in most RP situations. Not to mention bullets shot from Heirsbane were punched, absorbed and redirected in canon cutscenes. So this isn't something beyond defensible like it is in real life.
If the bullets themselves are just charges of aether without a solid object to be propelled, than it can be defended in most ways a spell can.
But remember we're a Japanese RPG, so parrying bullets is quite feasible in most RP situations. Not to mention bullets shot from Heirsbane were punched, absorbed and redirected in canon cutscenes. So this isn't something beyond defensible like it is in real life.