He found you sneaking inside the yiga hide out right in the banana room searching through one of the chests and hr will punish you for trying to steal and sneaking into the hideout. The room on which you're in is small and secluded so there are no other blade masters or foot soldiers in there besides him, no one will see or hear what he'll do to you. They stand about 6'3 feet tall and are actually quite bulky and well built. Though they look big and heavy these soldiers are actually quite fast and agile, the reason why they are so big unlike the foot soldiers is because they are blade masters, you can say they are kinda like the chiefs in the yiga clan, they also have powers like earthquake and to easily disappear in a cloud of bright smoke and scripts. This blade master specifically is named Baku.