Bladecaster's correct. As long as you stay away from that chest at the end of the corridor, those gargoyles won't appear. You can return to it at a later time.
If you do decide to take them out, try to get your tank to hit both gargoyles and gain their interest. Then, keep feeding him health potions, while both characters focus on a single gargoyle. The gargoyles won't shift interest once they've committed to a single team member, even if your other character gets in some good shots.