What is the central distinction between these two arrival examples?

Wāw with Nominal Circumstantial Clauses: Omission, Inclusion and Disputed Cases

• The first has a verbal ḥāl; the second a nominal ḥāl
• First is emphatic ḥāl, second temporary ḥāl
• Only the latter has a referential pronoun
• Both are nominal ḥāl and differ only by wāw