Tarquin studies the woman who backs away, seemedly choking at the odours of the battle, but then blinks, his gaze darting backwards down the tunnel as that sickly feeling of null-magic begins down there, and Tarquin actually hisses in fury - Such things he loathed... But his hiss dies down as that feeling fades - whatever made that seemed to have stopped now... Then, of course, comes a mans voice from that corridoor, and Tarquin seriously considers not replying - In any other circumstances, he would kill such a threat to his existence... but, null-magic could be quite effective for the future of their 'adventure', so his better judgement decides him to put aside his hatred for the moment, "Come, aid us..." His voice was just a broken, ragged whisper, but all the same it would seem to penetrate the sound of battle and the distance to reach the ears of the man down that corridoor.
Tarquin does not linger to await a response, however, and his attention turns once again back to the creature attacking them. He raises his right arm, pointing index and middle finger towards the creatures midsection and awaiting for a clear shot. The second he gets one, the mage utters in a broken, barely audible voice, "fulguritus..." Promptly, as though summoned, a spark of what seems to be pure, electrical energy vines around the mans fingers, as though hesitant to leave, but then, in a burst, and a crack of sound, the blue and pure white light darts from his finger, streaking with great speed towards the beast. Whether it hits or not, Tarquin's shoulders then slump, and his knees buckle slightly, causing him to stumble ungracefully back. His leg catches apon the hem of his black robe as he stumbles back, and he consequently looses his footing, falling down to the ground with a heavy exhalation of breath. Straight after, however, he pushes himself off the ground into a kneeling position, one hand raised to his forehead and his gaze cast to the ground. He is breathing quite heavily, and seems defenseless for the moment - If the creature has not been too effected by the spell, and if it manages to break past the others attacking it, it may have a quite clear shot to this weakened mage.