As long as you control a Mountain, Summit Apes has menace.
"If you climb Skyfang Peak, avoid the pass. Generations of apes made that trail, and they don't tolerate trespassers." —Sachir, Akoum Expeditionary House
2010-03-01
Whether you control a Mountain matters only as the defending player declares blockers. Once it's blocked, gaining or losing control of a Mountain won't affect Summit Apes's blockers.