How did the Buddha subdue fear and terror while standing, sitting, etc.?

The Bhaya Bherava Sutta (MN4) states the following: > ...I stayed in the sort of places that are awe-inspiring and make your hair stand on end, such as park-shrines, forest-shrines, & tree-shrines. And while I was staying there a wild animal would come, or a peacock would make a twig fall, or wind would rustle the fallen leaves. The thought would occur to me: 'Is this that fear & terror coming?' Then the thought occurred to me: 'Why do I just keep waiting for fear? > > What if I, in whatever state I'm in when fear & terror come to me, > were to subdue that fear & terror in that very state?' So when fear & > terror came to me while I was walking back & forth, I would not stand > or sit or lie down. I would keep walking back & forth until I had > subdued that fear & terror. When fear & terror came to me while I was > standing, I would not walk or sit or lie down. I would keep standing > until I had subdued that fear & terror. When fear & terror came to me > while I was sitting, I would not lie down or stand up or walk. I would > keep sitting until I had subdued that fear & terror. When fear & > terror came to me while I was lying down, I would not sit up or stand > or walk. I would keep lying down until I had subdued that fear & > terror. However, it does not say how the Buddha subdued the fear and terror while standing, sitting, etc. How could a practitioner understand and use this method?