...and so absorbed in the moment you lost all self-consciousness. (Para. 5)
be absorbed (in): give all one's attention (to) sth.
The artist was so absorbed in her work that she didn't hear her visitor enter the room. 这位艺术家聚精会神于自己的工作，以至于没有听到来访者进了房间。
Time passes quickly when you are absorbed in reading a good book. 当你全神贯注阅读一本好书时，时间会过得很快。
The structure "so + adj. /adv. +(that)" is used to express "to such a degree as to produce a particular result, causing a particular situation, etc. For example,
He was so ill (that) we had to send for a doctor. 他病得很重，我们得派人去请医生。