That's one interpretation. When referring not to other actions but to a word describing a location it becomes more ambiguous.
eg "pacing the frontier" could also mean they are impatiently or anxiously walking up and down the border.
That’s what I thought the original blog post was going to be about, pacing back and forth along the frontier. It’s a much more straightforward parse.
That's when one is supposed to employ their common sense for semantic disambiguation. Spoken languages are not programming languages. I for one found it easy to parse.
This is a more normal English meaning in my opinion — you picture a sentry patrolling a border.