Highly dubious and almost certainly incorrect form as emended by Bedjan met. caus. True, three syllables are needed, but "coming" is poetically a very week suggestion. Read perhaps ܡܜܝܚܐ as a qaṭṭīl form from mṭḥ "to lick": the sword was licking at their lives or perhaps with emendation "the sword was whetting itself".