Truly, this is the most efficient answer.

You spend a while observing one of the smaller mages, its patrol leads out of the sight of the larger ones, just out of earshot, and just behind a bush. Now is your chance to strike.

You leap from the bushes, brandishing magical ropes which you lash over the ogre's two mouths and pull him to the ground. However, you underestimated his strength and he pulls the magical ropes forward and you tumble into a nearby tree.

The damage is done, however, and he is silenced.